hy·a·cinth ['hī-ə-(,)sin(t)th, -sən(t)th] -n, adj
- a precious stone of the ancients sometimes held to be the sapphire
- a gem zircon or essonite
- a plant of the ancients held to be a lily, iris, larkspur, or gladiolus
- a bulbous perennial herb ( Hyacinthus orientalis) of the lily family that is native to the Mediterranean region but is widely grown for its dense spikes of fragrant flowers
- a light violet to moderate purple
Hy·a·cin·thus [,hī-ə-'sin(t)-thəs] -n
- a youth loved and accidentally killed by Apollo who memorializes him with a hyacinth growing from the youth's blood
Hy·a·des ['hī-ə-,dēz] -n pl
- a V-shaped cluster of stars in the head of the constellation Taurus held by the ancients to indicate rainy weather when they rise with the sun
hyal- -comb form
- glass : glassy : hyaline
hy·a·line ['hī-ə-lən, -,līn] -adj
- transparent or nearly so and usu. homogeneous
- something (as the clear atmosphere) that is transparent
- any of several translucent nitrogenous substances related to chitin, found esp. around cells, and readily stained by eosin
hyaline cartilage -n
- translucent bluish-white cartilage with the cells embedded in an apparently homogeneous matrix present in joints and respiratory passages and forming most of the fetal skeleton
hy·a·lite ['hī-ə-,līt] -n
- a colorless opal that is clear as glass or sometimes translucent or whitish
hy·a·loid [-,lȯid] -adj
- glassy, transparent
hy·a·lo·plasm [hī-'a-lə-,pla-zəm, 'hī-ə-lō-] -n
- cytosol
hy·al·uron·ic acid [,hīl-yu̇-'rä-nik-, ,hī-əl-yu̇-] -n
- a viscous glycosaminoglycan chiefly of the matrix of tissues that occurs esp. in the vitreous humor, umbilical cord, synovial fluid, and loose connective tissue and serves esp. as a structural element and lubricant
hy·al·uron·i·dase [-'rä-nə-,dās, -,dāz] -n
- a mucolytic enzyme that facilitates the spread of fluids through tissues by lowering the viscosity of hyaluronic acid
hy·brid ['hī-brəd] -n, adj
- an offspring of two animals or plants of different races, breeds, varieties, species, or genera
- a person whose background is a blend of two diverse cultures or traditions
- something heterogeneous in origin or composition : composite
- hybrid s of complementary DNA and RNA strands
- a hybrid of medieval and Renaissance styles
- something (as a power plant, vehicle, or electronic circuit) that has two different types of components performing essentially the same function
hybrid computer -n
- a computer system consisting of a combination of analog and digital computer systems
hy·brid·ize ['hī-brə-,dīz] -vb, n
- to cause to produce hybrids : interbreed
- to produce hybrids
hy·brid·oma [,hī-brə-'dō-mə] -n
- a hybrid cell produced by the fusion of an antibody-producing lymphocyte with a tumor cell and used to culture continuously a specific monoclonal antibody
hybrid tea rose -n
- any of numerous moderately hardy cultivated hybrid bush roses grown esp. for their strongly recurrent bloom of large usu. scentless flowers called also hybrid tea
hybrid vigor -n
- heterosis
hyd -abbr
- hydraulics
- hydrostatics
hy·da·thode ['hī-də-,thōd] -n
- a specialized pore on the leaves of higher plants that functions in the exudation of water
hy·da·tid ['hī-də-təd, -,tid] -n
- the larval cyst of a tapeworm (genus Echinococcus) occurring as a fluid-filled sac containing daughter cysts in which scolices develop
hydr- -comb form
- water
- liquid
- hydrogen : containing or combined with hydrogen
- hydroid
Hy·dra ['hī-drə] -n
- a many-headed serpent or monster in Greek mythology that was slain by Hercules and each head of which when cut off was replaced by two others
- a multifarious evil not to be overcome by a single effort
- a southern constellation of great length that lies south of Cancer, Sextans, Corvus, and Virgo and is represented on old maps by a serpent
- any of numerous small tubular freshwater hydrozoan polyps ( Hydraand related genera) having at one end a mouth surrounded by tentacles
hy·drahead·ed [,hī-drə-'he-dəd] -adj
- having many centers or branches
- a hydraheaded organization
hy·dral·azine [hī-'dra-lə-,zēn] -n
- a vasodilator C 8H 8N 4used in the form of its hydrochloride to treat hypertension
hy·dran·gea [hī-'drān-jə] -n
- any of a genus ( Hydrangea) of mostly shrubs having opposite leaves and showy clusters of usu. sterile white, pink, or bluish flowers that is either placed in the saxifrage family or the hydrangea family (Hydrangeaceae)
hy·drant ['hī-drənt] -n
- a discharge pipe with a valve and spout at which water may be drawn from a water main (as for fighting fires) called also fireplug
- faucet
hy·dranth ['hī-,dran(t)th] -n
- one of the feeding zooids of a hydroid colony
hy·drase ['hī-,drās, -,drāz] -n
- an enzyme that promotes the addition or removal of water to or from its substrate
hy·drate ['hī-,drāt] -n
- a compound formed by the union of water with some other substance
hydrate [hī-'drā-shən] -vb, n
- to cause to take up or combine with water or the elements of water
- to supply with ample fluid or moisture
- hydrate s and softens the skin
- to become a hydrate
hy·drau·lic [hī-'drȯ-lik] -adj, adv
- operated, moved, or effected by means of water
- of or relating to hydraulics
- of or relating to water or other liquid in motion
- operated by the resistance offered or the pressure transmitted when a quantity of liquid (as water or oil) is forced through a comparatively small orifice or through a tube
- hardening or setting under water
hy·drau·lics [hī-'drȯ-liks] -n pl but sing in constr
- a branch of science that deals with practical applications (as the transmission of energy or the effects of flow) of liquid (as water) in motion
hy·dra·zide ['hī-drə-,zīd] -n
- any of a class of compounds resulting from the replacement of hydrogen by an acid group in hydrazine or in one of its derivatives
hy·dra·zine ['hī-drə-,zēn] -n
- a colorless fuming corrosive strongly reducing liquid base N 2H 4used esp. in fuels for rocket and jet engines
- an organic base derived from this compound
hy·dra·zo·ic acid [,hī-drə-'zō-ik-] -n
- a colorless volatile poisonous explosive liquid HN 3that has a foul odor and yields explosive salts of heavy metals
hy·dric ['hī-drik] -adj
- characterized by, relating to, or requiring an abundance of moisture
hy·dride ['hī-,drīd] -n
- a compound of hydrogen with a more electropositive element or group
hy·dril·la [hī-'dri-lə] -n
- a freshwater aquatic Asian plant ( Hydrilla verticillataof the Hydrocharitaceae family) that has small narrow leaves growing in whorls of three to eight around stems which become heavily branched near the water surface
hy·dri·od·ic acid [,hī-drē-'ä-dik-] -n
- an aqueous solution of hydrogen iodide HI that is a strong acid and a strong reducing agent
hy·dro ['hī-(,)drō] -n
- an establishment offering hydropathic treatment (as for weight loss) : health spa
hydro -n
- hydroelectric power
hy·dro·bi·ol·o·gy [,hī-drō-bī-'ä-lə-jē] -n, adj
- the biology of bodies or units of water
- limnology
hy·dro·bro·mic acid [,hī-drə-'brō-mik-] -n
- an aqueous solution of hydrogen bromide HBr that is a strong acid and a weak reducing agent and that is used esp. for making bromides
hy·dro·car·bon ['hī-drō-,kär-bən] -n
- an organic compound (as acetylene or butane) containing only carbon and hydrogen and often occurring in petroleum, natural gas, coal, and bitumens
hy·dro·cele ['hī-drə-,sēl] -n
- an accumulation of serous fluid in a saclike cavity (as the scrotum)
hy·dro·ce·phal·ic [,hī-drō-sə-'fa-lik] -adj, n
- relating to, characterized by, or affected with hydrocephalus
hy·dro·ceph·a·lus [-'se-fə-ləs] -n
- an abnormal increase in the amount of cerebrospinal fluid within the cranial cavity that is accompanied by expansion of the cerebral ventricles, enlargement of the skull and esp. the forehead, and atrophy of the brain
hy·dro·chlo·ric acid [,hī-drə-'klȯr-ik-] -n
- an aqueous solution of hydrogen chloride HCl that is a strong corrosive irritating acid, is normally present in dilute form in gastric juice, and is widely used in industry and in the laboratory
hy·dro·chlo·ride [-'klȯr-,īd] -n
- a chemical complex composed of an organic base (as an alkaloid) in association with hydrogen chloride
hy·dro·chlo·ro·fluo·ro·car·bon [-,klȯr-ō-,flȯr-ō-'kär-bən, -,flu̇r-] -n
- any of several simple gaseous compounds that contain carbon, chlorine, fluorine, and hydrogen
hy·dro·chlo·ro·thi·a·zide [-,klȯr-ə-'thī-ə-,zīd] -n
- a diuretic and antihypertensive drug C 7H 8ClN 3O 4S 2
hy·dro·col·loid [,hī-drə-'kä-,lȯid] -n, adj
- a substance that yields a gel with water
hy·dro·cor·ti·sone [-'kȯr-tə-,sōn, -,zōn] -n
- cortisol
- cortisol used pharmaceutically
hy·dro·crack·ing ['hī-drə-,kra-kiŋ] -n, vt
- the cracking of hydrocarbons in the presence of hydrogen
hy·dro·cy·an·ic acid [,hī-drō-sī-'a-nik-] -n
- an aqueous solution of hydrogen cyanide HCN that is a poisonous weak acid and is used chiefly in fumigating and in organic synthesis
hy·dro·dy·nam·ic [-dī-'na-mik] -adj, adv
- of, relating to, or involving principles of hydrodynamics
hy·dro·dy·nam·ics [-miks] -n pl but sing in constr, n
- a branch of physics that deals with the motion of fluids and the forces acting on solid bodies immersed in fluids and in motion relative to them
hy·dro·elec·tric [,hī-drō-i-'lek-trik] -adj, adv, n
- of or relating to production of electricity by waterpower
- constructed a hydroelectric power plant at the dam site
hy·dro·flu·or·ic acid [,hī-drō-'flȯr-ik, -'flu̇r-] -n
- an aqueous solution of hydrogen fluoride HF that is a weak poisonous acid, that attacks silica and silicates, and that is used esp. in finishing and etching glass
hy·dro·fluo·ro·car·bon [-,flȯr-ō-'kär-bən, -,flu̇r-] -n
- any of several simple gaseous compounds that contain carbon, fluorine, and hydrogen
hy·dro·foil ['hī-drə-,fȯi(-ə)l] -n
- a body similar to an airfoil but designed for action in or on water
- a motorboat that has metal plates or fins attached by struts fore and aft for lifting the hull clear of the water as speed is attained
hy·dro·gel ['hī-drə-,jel] -n
- a gel composed usu. of one or more polymers suspended in water
hy·dro·gen ['hī-drə-jən, -dər-] -n, adj
- a nonmetallic element that is the simplest and lightest of the elements, is normally a colorless odorless highly flammable diatomic gas, and is used esp. in synthesis
hy·drog·e·nase [hī-'drä-jə-,nās, -,nāz] -n
- an enzyme of various microorganisms that promotes the formation and utilization of gaseous hydrogen
hy·dro·ge·nate [hī-'drä-jə-,nāt, 'hī-drə-] -vt, n
- to combine or treat with or expose to hydrogen
- to add hydrogen to the molecule of (an unsaturated organic compound)
hydrogen bomb -n
- a bomb whose violent explosive power is due to the sudden release of atomic energy resulting from the fusion of light nuclei (as of hydrogen atoms) at very high temperature and pressure to form helium nuclei
hydrogen bond -n
- an electrostatic attraction between a hydrogen atom in one polar molecule (as of water) and a small electronegative atom (as of oxygen, nitrogen, or fluorine) in usu. another molecule of the same or a different polar substance
hydrogen bromide -n
- a colorless irritating gas HBr that fumes in moist air and yields hydrobromic acid when dissolved in water
hydrogen chloride -n
- a colorless pungent poisonous gas HCl that fumes in moist air and yields hydrochloric acid when dissolved in water
hydrogen cyanide -n
- a poisonous usu. gaseous compound HCN that has the odor of bitter almonds
- hydrocyanic acid
hydrogen fluoride -n
- a colorless corrosive fuming usu. gaseous compound HF that yields hydrofluoric acid when dissolved in water
hydrogen iodide -n
- an acrid colorless gas HI that fumes in moist air and yields hydriodic acid when dissolved in water
hydrogen ion -n
- the cation H of acids consisting of a hydrogen atom whose electron has been transferred to the anion of the acid
- hydronium
hydrogen peroxide -n
- an unstable compound H 2O 2used esp. as an oxidizing and bleaching agent, an antiseptic, and a propellant
hydrogen sulfide -n
- a flammable poisonous gas H 2S that has an odor suggestive of rotten eggs and is found esp. in many mineral waters and in putrefying matter
hy·dro·ge·ol·o·gy [,hī-drō-jē-'ä-lə-jē] -n
- a branch of geology concerned with the occurrence, use, and functions of surface water and groundwater
- the phenomena dealt with in hydrogeology
hy·dro·graph·ic [,hī-drə-'gra-fik] -adj, n
- of or relating to the characteristic features (as flow or depth) of bodies of water
- relating to the charting of bodies of water
hy·droid ['hī-,drȯid] -adj
- of or relating to a hydrozoan
- resembling a typical hydra
hydroid -n
- hydrozoan
- a hydrozoan polyp as distinguished from a hydrozoan jellyfish
hy·dro·ki·net·ic [,hī-drō-kə-'ne-tik, -(,)kī-] -adj
- of or relating to the motions of fluids or the forces which produce or affect such motions
hy·dro·lase ['hī-drə-,lās, -,lāz] -n
- a hydrolytic enzyme
hydrologic cycle -n
- the sequence of conditions through which water passes from vapor in the atmosphere through precipitation upon land or water surfaces and ultimately back into the atmosphere as a result of evaporation and transpiration called also hydrological cycle
hy·drol·o·gy [hī-'drä-lə-jē] -n, adj, adv
- a science dealing with the properties, distribution, and circulation of water on and below the earth's surface and in the atmosphere
hy·dro·ly·sate [hī-'drä-lə-,sāt] -n
- a product of hydrolysis
hy·dro·ly·sis [hī-'drä-lə-səs] -n, adj, adv
- a chemical process of decomposition involving the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion of water
hy·dro·lyze ['hī-drə-,līz] -vb, adj
- to subject to hydrolysis
- to undergo hydrolysis
hy·dro·mag·net·ic [,hī-drō-mag-'ne-tik] -adj
- magnetohydrodynamic
hy·dro·man·cy ['hī-drə-,man(t)-sē] -n
- divination by the appearance or motion of liquids (as water)
hy·dro·mas·sage [,hī-drō-mə-'säzh, -'säj] -n
- a massage using jets of water
- spa
hy·dro·me·chan·i·cal [,hī-drō-mi-'ka-ni-kəl] -adj, n pl but sing in constr
- relating to a branch of mechanics that deals with the equilibrium and motion of fluids and of solid bodies immersed in them
hy·dro·me·du·sa [,hī-drō-mi-'dü-sə, -'dyü-, -zə] -n
- a jellyfish (as of the orders Anthomedusae and Leptomedusae) produced as a bud from a hydroid
hy·dro·met·al·lur·gy [,hī-drō-'me-tə-,lər-jē] -n, adj
- the treatment of ores by wet processes (as leaching)
hy·dro·me·te·or [,hī-drō-'mē-tē-ər, -tē-,ȯr] -n
- a product (as rain) formed by the condensation of atmospheric water vapor
hy·dro·me·te·o·rol·o·gy [-,mē-tē-ə-'rä-lə-jē] -n, adj
- a branch of meteorology that deals with water in the atmosphere esp. as precipitation
hy·drom·e·ter [hī-'drä-mə-tər] -n, adj
- an instrument for determining the specific gravity of a liquid (as battery acid or an alcohol solution) and hence its strength
hy·dro·mor·phic [,hī-drə-'mȯr-fik] -adj
- developed in the presence of an excess of moisture which tends to suppress aerobic factors in soil-building
hy·dron·ic [hī-'drä-nik] -adj, adv
- of, relating to, or being a system of heating or cooling that involves transfer of heat by a circulating fluid (as water or vapor) in a closed system of pipes
hy·dro·ni·um [hī-'drō-nē-əm] -n
- a hydrated hydrogen ion H 3O
hy·drop·a·thy [hī-'drä-pə-thē] -n, adj
- a method of treating disease by copious and frequent use of water both externally and internally
hy·dro·per·ox·ide [,hī-drō-pə-'räk-,sīd] -n
- a compound containing an O 2H group
hy·dro·phane ['hī-drə-,fān] -n
- a semitranslucent opal that becomes translucent or transparent on immersion in water
hy·dro·phil·ic [,hī-drə-'fi-lik] -adj, n
- of, relating to, or having a strong affinity for water
hy·dro·pho·bia [,hī-drə-'fō-bē-ə] -n
- rabies
- a morbid dread of water
hy·dro·pho·bic [-'fō-bik] -adj, n
- of, relating to, or suffering from hydrophobia
- lacking affinity for water
hy·dro·phone ['hī-drə-,fōn] -n
- an instrument for listening to sound transmitted through water
hy·dro·phyte [-,fīt] -n, adj
- a plant that grows either partly or totally submerged in water
- a plant growing in waterlogged soil
hy·dro·plane ['hī-drə-,plān] -n
- a powerboat designed for racing that skims the surface of the water
- seaplane
hydroplane -vi
- to skim on water
- to skid on a wet surface (as pavement) because a film of water on the surface causes the tires to lose contact with it
hy·dro·pon·ics [,hī-drə-'pä-niks] -n pl but sing in constr, adj, adv
- the growing of plants in nutrient solutions with or without an inert medium (as soil) to provide mechanical support
hy·dro·pow·er ['hī-drə-,pau̇(-ə)r] -n
- hydroelectric power
hy·dro·qui·none [,hī-drō-kwi-'nōn, -'kwi-,nōn] -n
- a white crystalline strongly reducing phenol C 6H 6O 2used esp. as a photographic developer, as an antioxidant and stabilizer, and in medicine to remove pigmentation from hyperpigmented areas of skin
hy·dro·sere ['hī-drə-,sir] -n
- an ecological sere originating in an aquatic habitat
hy·dro·sol ['hī-drə-,säl, -,sȯl] -n, adj
- a sol in which the liquid is water
hy·dro·space [-,spās] -n
- the regions beneath the surface of the ocean
hy·dro·sphere [-,sfir] -n, adj
- the aqueous vapor of the atmosphere
- the aqueous envelope of the earth including bodies of water and aqueous vapor in the atmosphere
hy·dro·stat·ic [,hī-drə-'sta-tik] -adj, adv
- of or relating to fluids at rest or to the pressures they exert or transmit
hy·dro·stat·ics [-tiks] -n pl but sing in constr
- a branch of physics that deals with the characteristics of fluids at rest and esp. with the pressure in a fluid or exerted by a fluid on an immersed body
hy·dro·ther·a·py [,hī-drə-'ther-ə-pē] -n
- the therapeutic use of water (as in a whirlpool bath)
hy·dro·ther·mal [,hī-drə-'thər-məl] -adj, adv
- of or relating to hot water used esp. of the formation of minerals by hot solutions rising from a cooling magma
hydrothermal vent -n
- a fissure in the ocean floor esp. at or near a mid-ocean ridge from which mineral-rich superheated water issues
hy·dro·tho·rax [-'thȯr-,aks] -n
- an excess of serous fluid in the pleural cavity
- an effusion resulting from failing circulation (as in heart disease or from lung infection)
hy·drot·ro·pism [hī-'drä-trə-,pi-zəm] -n, adj
- a tropism (as in plant roots) in which water or water vapor is the orienting factor
hy·drous ['hī-drəs] -adj
- containing water usu. in chemical association (as in hydrates)
hy·drox·ide [hī-'dräk-,sīd] -n
- the monovalent anion OH consisting of one atom of hydrogen and one of oxygen called also hydroxide ion
- an ionic compound of hydroxide with an element or group
hy·droxy [hī-'dräk-sē] -adj
- being or containing hydroxyl
- containing hydroxyl esp. in place of hydrogen usu. used in combination
hy·droxy·ap·a·tite [hī-,dräk-sē-'a-pə-,tīt] -n
- a complex phosphate of calcium Ca 5(PO 4) 3OH that occurs as a mineral and is the chief structural element of vertebrate bone
hy·droxy·bu·tyr·ic acid [hī-,dräk-sē-byu̇-'tir-ik-] -n
- a hydroxy derivative C 4H 8O 3of butyric acid that is excreted in increased quantities in the urine in diabetes
hy·drox·yl [hī-'dräk-səl] -n, adj
- the chemical group, ion, or radical OH that consists of one atom of hydrogen and one of oxygen and is neutral or negatively charged
- hydroxide
hy·drox·yl·amine [hī-'dräk-sə-lə-,mēn, ,hī-,dräk-'si-lə-,mēn] -n
- a colorless odorless nitrogenous base NH 3O that resembles ammonia in its reactions but is less basic and that is used esp. as a reducing agent
hy·drox·y·lase [hī-'dräk-sə-,lās, -,lāz] -n
- any of a group of enzymes that catalyze oxidation reactions in which one of the two atoms of molecular oxygen is incorporated into the substrate and the other is used to oxidize NADH or NADPH
hy·drox·yl·ate [hī-'dräk-sə-,lāt] -vt, n
- to introduce hydroxyl into
hy·droxy·pro·line [hī-,dräk-sē-'prō-,lēn] -n
- an amino acid C 5H 9NO 3that occurs naturally as a constituent of collagen
hy·droxy·tryp·ta·mine [-'trip-tə-,mēn] -n
- serotonin usu. preceded by the numeral 5
hy·droxy·urea [-yu̇-'rē-ə] -n
- a drug CH 4N 2O 2used to treat some forms of leukemia, melanoma, and malignant tumors
hy·droxy·zine [hī-'dräk-sə-,zēn] -n
- a compound C 21H 27ClN 2O 2used as an antihistamine and tranquilizer
hy·dro·zo·an [,hī-drə-'zō-ən] -n, adj
- any of a class (Hydrozoa) of coelenterates that includes solitary and colonial polyps and jellyfishes having no stomodeum or gastric tentacles
hy·e·na [hī-'ē-nə] -n, adj
- any of several large strong nocturnal carnivorous Old World mammals (family Hyaenidae) that usu. feed as scavengers
Hy·ge·ia [hī-'jē-ə] -n
- the goddess of health in Greek mythology
hy·giene ['hī-,jēn also hī-'] -n
- a science of the establishment and maintenance of health
- conditions or practices (as of cleanliness) conducive to health
hy·gien·ic [,hī-'jē-nik, -'je- also -jē-'e-nik] -adj, adv
- of or relating to hygiene
- having or showing good hygiene
- antiseptic
- sweetly hygienic production...comic in an entirely innocuous way -- J. W. Aldridge
- antiseptic
- a hygienic view of national realities and moral imperatives -- I. L. Horowitz
hy·gien·ics [,hī-'jē-niks, -'je- also -jē-'e-niks] -n pl but sing in constr
- hygiene
hygr- -comb form
- humidity : moisture
hy·gro·graph ['hī-grə-,graf] -n
- an instrument for recording automatically variations in atmospheric humidity
hy·grom·e·ter [hī-'grä-mə-tər] -n, adj
- any of several instruments for measuring the humidity of the atmosphere
hy·groph·i·lous [hī-'grä-fə-ləs] -adj
- living or growing in moist places
hy·gro·scop·ic [,hī-grə-'skä-pik] -adj, n
- readily taking up and retaining moisture
- taken up and retained under some conditions of humidity and temperature
- hygroscopic water in clay
hying ['hī] -vb
(variant of hie)
- to go quickly : hasten
- to cause (oneself) to go quickly
Hyk·sos ['hik-,säs, -,sōs] -adj
- of or relating to a Semite dynasty that ruled Egypt from about the 18th to the 16th century b.c.
hy·lo·zo·ism [,hī-lə-'zō-,i-zəm] -n, adj
- a doctrine held esp. by early Greek philosophers that all matter has life
hy·men ['hī-mən] -n, adj
- a fold of mucous membrane partly closing the orifice of the vagina
Hymen -n
- the Greek god of marriage
hy·me·ne·al [,hī-mə-'nē-əl] -adj, adv
- nuptial
hymeneal -n
- nuptials
- a wedding hymn
hy·me·ni·um [hī-'mē-nē-əm] -n
- a spore-bearing layer in fungi
hy·me·nop·ter·an [,hī-mə-'näp-tə-rən] -n, adj
- any of an order (Hymenoptera) of highly specialized insects with complete metamorphosis that include the bees, wasps, ants, ichneumon flies, sawflies, gall wasps, and related forms, often associate in large colonies with complex social organization, and have usu. four membranous wings and the abdomen generally borne on a slender pedicel
hy·me·nop·ter·on [-tə-,rän, -rən] -n
- hymenopteran
hymn ['him] -n, adj
- a song of praise to God
- a metrical composition adapted for singing in a religious service
- a song of praise or joy
- something resembling a hymn : paean
- to praise or worship in or as if in hymns
- the heroes hymn ed in this book
- to sing a hymn
hym·nal ['him-nəl] -n
- a collection of church hymns
hym·na·ry ['him-nə-rē] -n
- hymnal
hymn·book ['him-,bu̇k] -n
- hymnal
hym·no·dy ['him-nə-dē] -n
- hymn singing
- hymn writing
- the hymns of a time, place, or church
hym·nol·o·gy [him-'nä-lə-jē] -n
- hymnody
- the study of hymns
hy·oid ['hī-,ȯid] -adj
- of or relating to the hyoid bone
hyoid bone -n
- a U-shaped bone or complex of bones that is situated between the base of the tongue and the larynx and that supports the tongue, the larynx, and their muscles called also hyoid
hy·o·scine ['hī-ə-,sēn] -n
- scopolamine
- the levorotatory form of scopolamine
hy·o·scy·a·mine [,hī-ə-'sī-ə-,mēn] -n
- a poisonous crystalline alkaloid C 17H 23NO 3of which atropine is a racemic mixture
- its levorotatory form found esp. in the plants belladonna and henbane and used similarly to atropine
hyp -abbr
- hypothesis; hypothetical
hyp·abys·sal [,hi-pə-'bi-səl, ,hī-] -adj, adv
- of or relating to a fine-grained igneous rock usu. formed at a moderate distance below the surface
hy·pae·thral [hī-'pē-thrəl] -adj
- having a roofless central space
- open to the sky
hy·pal·la·ge [hī-'pa-lə-jē, hi-] -n
- an interchange of two elements in a phrase or sentence from a more logical to a less logical relationship (as in a mind is a terrible thing to waste for to waste a mind is a terrible thing)
hy·pan·thi·um [hī-'pan(t)-thē-əm] -n
- an enlargement of the floral receptacle bearing on its rim the stamens, petals, and sepals and often enlarging and surrounding the fruits (as in the rose hip)
hype ['hīp] -n
- a narcotics addict
- hypodermic
- stimulate, enliven usu. used with up
- hyping herself up for the game
- increase
- put on, deceive
- to promote or publicize extravagantly
- hyping this fall's TV lineup
- deception, put-on
- publicity
- promotional publicity of an extravagant or contrived kind
- all the hype before the boxing match
- excellent, cool
hy·per ['hī-pər] -adj
- high-strung, excitable
- highly excited
- extremely active
hyper- -prefix
- above : beyond : super-
- excessively
- excessive
- that is or exists in a space of more than three dimensions
- bridging points within an entity (as a database or network) nonsequentially
hy·per·acid·i·ty [,hī-pər-ə-'si-də-tē] -n, adj
- the condition of containing more than the normal amount of acid
hy·per·ac·tive [,hī-pər-'ak-tiv] -adj, n
- affected with or exhibiting hyperactivity
- more active than is usual or desirable
- intricately or elaborately designed or detailed
hy·per·ac·tiv·i·ty [-,ak-'ti-və-tē] -n
- the state or condition of being excessively or pathologically active
- attention deficit disorder
hyperaesthesia [,hī-pər-es-'thē-zh(ē-)ə] -n, adj
(variant of hyperesthesia)
- unusual or pathological sensitivity of the skin or of a particular sense
hy·per·al·i·men·ta·tion [,hī-pər-,a-lə-mən-'tā-shən] -n
- the administration of nutrients by intravenous feeding esp. to patients who cannot ingest food through the alimentary tract
hy·per·bar·ic [,hī-pər-'ber-ik, -'ba-rik] -adj, adv
- of, relating to, or utilizing greater than normal pressure esp. of oxygen
hy·per·bo·la [hī-'pər-bə-lə] -n
- a plane curve generated by a point so moving that the difference of the distances from two fixed points is a constant : a curve formed by the intersection of a double right circular cone with a plane that cuts both halves of the cone
hy·per·bo·le [hī-'pər-bə-(,)lē] -n
- extravagant exaggeration (as mile-high ice-cream cones)
hy·per·bol·ic [,hī-pər-'bä-lik] -adj, adv
- of, relating to, or marked by hyperbole
hyperbolic -adj
- of, relating to, or being analogous to a hyperbola
- of, relating to, or being a space in which more than one line parallel to a given line passes through a point
hyperbolic function -n
- any of a set of six functions analogous to the trigonometric functions but related to the hyperbola in a way similar to that in which the trigonometric functions are related to a circle
hyperbolic paraboloid -n
- a saddle-shaped quadric surface whose sections by planes parallel to one coordinate plane are hyperbolas while those sections by planes parallel to the other two are parabolas if proper orientation of the coordinate axes is assumed
hy·per·bo·lize [hī-'pər-bə-,līz] -vb
- to indulge in hyperbole
- to exaggerate to a hyperbolic degree
hy·per·bo·loid [-,lȯid] -n, adj
- a quadric surface whose sections by planes parallel to one coordinate plane are ellipses while those sections by planes parallel to the other two are hyperbolas if proper orientation of the axes is assumed
hy·per·bo·re·an [,hī-pər-'bȯr-ē-ən, -(,)pər-bə-'rē-ən] -n
- a member of a people held by the ancient Greeks to live beyond the north wind in a region of perpetual sunshine
- an inhabitant of a cool northern climate
hyperborean -adj
- of or relating to an extreme northern region : frozen
- of or relating to any of the arctic peoples
hy·per·cal·ce·mia [,hī-pər-,kal-'sē-mē-ə] -n, adj
- an excess of calcium in the blood
hy·per·cap·nia [-'kap-nē-ə] -n, adj
- the presence of excessive amounts of carbon dioxide in the blood
hy·per·cat·a·lex·is [-,ka-tə-'lek-səs] -n, adj
- the occurrence of an additional syllable after the final complete foot or dipody in a line of verse
hy·per·charge ['hī-pər-,chärj] -n
- a quantum characteristic of a group of subatomic particles governed by the strong force that is related to strangeness and is represented by a number equal to twice the average value of the electric charge of the group
hy·per·cho·les·ter·ol·emia [,hī-pər-kə-,les-tə-rə-'lē-mē-ə] -n, adj
- the presence of excess cholesterol in the blood
hy·per·cor·rect [,hī-pər-kə-'rekt] -adj, n, adv
- of, relating to, or characterized by the production of a nonstandard linguistic form or construction on the basis of a false analogy (as badly in my eyes have gone badly and widely in open widely)
hy·per·crit·ic [,hī-pər-'kri-tik] -n
- a carping or unduly censorious critic
hy·per·crit·i·cal [-'kri-ti-kəl] -adj, adv
- meticulously or excessively critical
hy·per·cube ['hī-pər-,kyüb] -n
- a geometric figure (as a tesseract) in Euclidean space of ndimensions that is analogous to a cube in three dimensions
- a computer architecture in which each processor is connected to nothers based on analogy to a hypercube of ndimensions
hy·per·drive ['hī-pər-,drīv] -n
- a state of extremely heightened activity
- the promotions department went into hyperdrive
hy·per·emia [,hī-pər-'ē-mē-ə] -n, adj
- excess of blood in a body part : congestion
hy·per·es·the·sia [,hī-pər-es-'thē-zh(ē-)ə] -n, adj
- unusual or pathological sensitivity of the skin or of a particular sense
hy·per·eu·tec·tic [,hī-pər-yu̇-'tek-tik] -adj
- hypereutectoid
hy·per·eu·tec·toid [-,tȯid] -adj
- containing the minor component in excess of that contained in the eutectoid
hy·per·ex·tend [,hī-pər-ik-'stend] -vt, n
- to extend so that the angle between bones of a joint is greater than normal
- to extend (as a body part) beyond the normal range of motion
hy·per·fine ['hī-pər-,fīn] -adj
- being or relating to a fine-structure multiplet occurring in an atomic spectrum that is due to interaction between electrons and nuclear spin
hy·per·fo·cal distance [,hī-pər-'fō-kəl-] -n
- the nearest distance upon which a photographic lens may be focused to produce satisfactory definition at infinity
hy·per·ga·my [hī-'pər-gə-mē] -n
- marriage into an equal or higher caste or social group
hy·per·geo·met·ric distribution [,hī-pər-,jē-ə-'me-trik-] -n
- a probability function f(x)that gives the probability of obtaining exactly xelements of one kind and n xelements of another if nelements are chosen at random without replacement from a finite population containing Nelements of which Mare of the first kind and N Mare of the second kind and that has the form
hy·per·gly·ce·mia [,hī-pər-glī-'sē-mē-ə] -n, adj
- excess of sugar in the blood
hy·per·gol·ic [,hī-pər-'gä-lik] -adj, adv
- igniting upon contact of components without external aid (as a spark)
- of, relating to, or using hypergolic fuel
hy·per·hi·dro·sis [,hī-pər-hī-'drō-səs] -n
- generalized or local excessive sweating
hy·per·in·fla·tion [,hī-pər-in-'flā-shən] -n, adj
- inflation growing at a very high rate in a very short time
- a period of hyperinflation
hy·per·in·su·lin·ism [,hī-pər-'in(t)-s(ə-)lə-,ni-zəm] -n
- the presence of excess insulin in the body resulting in hypoglycemia
Hy·pe·ri·on [hī-'pir-ē-ən] -n
- a Titan and the father of Eos, Selene, and Helios
hy·per·ir·ri·ta·bil·i·ty [,hī-pər-,ir-ə-tə-'bi-lə-tē] -n, adj
- abnormally great or uninhibited response to stimuli
hy·per·ker·a·to·sis [,hī-pər-,ker-ə-'tō-səs] -n, adj
- hypertrophy of the corneous layer of the skin
hy·per·ki·ne·sia [-kə-'nē-zh(ē-)ə, -kī-] -n
- hyperkinesis
hy·per·ki·ne·sis [-'nē-səs] -n
- abnormally increased and sometimes uncontrollable activity or muscular movements
- a condition esp. of childhood characterized by hyperactivity
hy·per·ki·net·ic [-'ne-tik] -adj
- of, relating to, or affected with hyperkinesis or hyperactivity
- characterized by fast-paced or frenetic activity
hy·per·link ['hī-pər-,liŋk] -n, vt
- an electronic link providing direct access from one distinctively marked place in a hypertext or hypermedia document to another in the same or a different document
hy·per·li·pe·mia [,hī-pər-lī-'pē-mē-ə] -n, adj
- hyperlipidemia
hy·per·lip·id·emia [-,li-pə-'dē-mē-ə] -n
- the presence of excess fat or lipids in the blood
hy·per·mar·ket ['hī-pər-,mär-kət] -n
- a very large store that carries products found in a supermarket as well as merchandise commonly found in department stores
hy·per·me·dia [-,mē-dē-ə] -n
- a database format similar to hypertext in which text, sound, or video images related to that on a display can be accessed directly from the display
hy·per·me·ter [hī-'pər-mə-tər] -n, adj
- a verse marked by hypercatalexis
- a period comprising more than two or three cola
hy·per·me·tro·pia [,hī-pər-mi-'trō-pē-ə] -n, adj
- hyperopia
hy·perm·ne·sia [,hī-(,)pərm-'nē-zh(ē-)ə] -n, adj
- abnormally vivid or complete memory or recall of the past
hy·per·on ['hī-pə-,rän] -n
- an elementary particle of the baryon group having greater mass than a nucleon
hy·per·opia [,hī-pə-'rō-pē-ə] -n, adj
- a condition in which visual images come to a focus behind the retina of the eye and vision is better for distant than for near objects called also farsightedness
hy·per·os·to·sis [,hī-pər-,äs-'tō-səs] -n, adj
- excessive growth or thickening of bone tissue
hy·per·par·a·site [,hī-pər-'per-ə-,sīt, -'pa-rə-] -n, adj
- a parasite that is parasitic upon another parasite
hy·per·para·thy·roid·ism [-,per-ə-'thī-,rȯi-,di-zəm, -,pa-rə-] -n
- the presence of excess parathyroid hormone in the body resulting in disturbance of calcium metabolism with increase in serum calcium and decrease in inorganic phosphorus, loss of calcium from bone, and renal damage with frequent kidney-stone formation
hy·per·pha·gia [-'fā-j(ē-)ə] -n, adj
- abnormally increased appetite for consumption of food frequently associated with injury to the hypothalamus
hy·per·pi·tu·ita·rism [-pə-'tü-ə-tə-,ri-zəm, -'tü-ə-,tri-, -'tyü-] -n, adj
- excessive production of growth hormones by the pituitary gland
hy·per·plane ['hī-pər-,plān] -n
- a figure in hyperspace corresponding to a plane in ordinary space
hy·per·pla·sia [,hī-pər-'plā-zh(ē-)ə] -n, adj
- an abnormal or unusual increase in the elements composing a part (as cells composing a tissue)
hy·per·ploid ['hī-pər-,plȯid] -adj, n
- having a chromosome number slightly greater than an exact multiple of the monoploid number
hy·per·pnea [,hī-pər-'nē-ə, -,pərp-'nē-] -n, adj
- abnormally rapid or deep breathing
hy·per·po·lar·ize [,hī-pər-'pō-lə-,rīz] -vt, n
- to produce an increase in potential difference across (a biological membrane)
- to undergo or produce an increase in potential difference across something
hy·per·py·rex·ia [-pī-'rek-sē-ə] -n
- exceptionally high fever (as in a particular disease)
hy·per·re·al·ism [,hī-pər-'rē-ə-,li-zəm, -'rēl-,i-] -n, adj
- realism in art characterized by depiction of real life in an unusual or striking manner
hy·per·sen·si·tive [,hī-pər-'sen(t)-s(ə-)tiv] -adj, n
- excessively or abnormally sensitive
- abnormally susceptible physiologically to a specific agent (as a drug or antigen)
hy·per·sex·u·al [-'sek-sh(ə-)wəl, -'sek-shəl] -adj, n
- exhibiting unusual or excessive concern with or indulgence in sexual activity
hy·per·son·ic [-'sä-nik] -adj, adv
- of or relating to speed five or more times that of sound in air
- moving, capable of moving, or utilizing air currents that move at hypersonic speed
hy·per·space ['hī-pər-,spās] -n
- space of more than three dimensions
- a fictional space held to support extraordinary events (as travel faster than the speed of light)
hy·per·sthene ['hī-pərs-,thēn] -n, adj
- an orthorhombic grayish or greenish black or dark brown pyroxene
hy·per·sur·face ['hī-pər-,sər-fəs] -n
- a figure that is the analogue in hyperspace of a surface in three-dimensional space
hy·per·ten·sion [,hī-pər-'ten(t)-shən] -n
- abnormally high blood pressure and esp. arterial blood pressure
- the systemic condition accompanying high blood pressure
hy·per·ten·sive [,hī-pər-'ten(t)-siv] -adj
- affected with or caused by hypertension
hypertensive -n
- an individual affected with hypertension
hy·per·text ['hī-pər-,tekst] -n, adj
- a database format in which information related to that on a display can be accessed directly from the display
- material (as text) in this format
hypertext markup language -n
- HTML
hypertext transfer protocol -n
- a communications protocol governing the exchange of data (as HTML files) esp. on the World Wide Web called also hypertext transport protocol
hy·per·ther·mia [,hī-pər-'thər-mē-ə] -n, adj
- exceptionally high fever esp. when induced artificially for therapeutic purposes
hy·per·ther·mo·phile [,hī-pər-'thər-mə-,fī(-ə)l] -n, adj
- an organism that lives in extremely hot environments (as hot springs) with temperatures around the boiling point of water
hy·per·thy·roid [-'thī-,rȯid] -adj
- of, relating to, or affected with hyperthyroidism
hy·per·thy·roid·ism [-,rȯi-,di-zəm] -n
- excessive functional activity of the thyroid gland
- the resulting condition marked esp. by increased metabolic rate, enlargement of the thyroid gland, rapid heart rate, and high blood pressure
hy·per·to·nia [,hī-pər-'tō-nē-ə] -n
- the condition of exhibiting excessive muscular tone or tension
hy·per·ton·ic [-'tä-nik] -adj
- exhibiting excessive tone or tension
- having a higher osmotic pressure than a surrounding medium or a fluid under comparison
hy·per·to·nic·i·ty [-tə-'ni-sə-tē] -n
- the condition of being hypertonic
- hypertonia
hy·per·tro·phy [hī-'pər-trə-fē] -n, adj
- excessive development of an organ or part
- increase in bulk (as by thickening of muscle fibers) without multiplication of parts
- exaggerated growth or complexity
hypertrophy -vi
- to undergo hypertrophy
hy·per·ur·ban·ism [,hī-pər-'ər-bə-,ni-zəm] -n
- use of hypercorrect forms in language
- such a form
hy·per·uri·ce·mia [,hī-pər-,yu̇r-ə-'sē-mē-ə] -n
- excess uric acid in the blood
hy·per·var·i·able [,hī-pər-'ver-ē-ə-bəl] -adj
- relating to or being any of the relatively short extremely variable polypeptide chain segments in the light chain or heavy chain of an antibody
- relating to, containing, or being a highly variable nucleotide sequence
hy·per·ve·loc·i·ty [-və-'lä-sə-tē, -'läs-tē] -n
- a high or relatively high velocity (as thousands of feet or meters per second)
hy·per·ven·ti·late [,hī-pər-'ven-tə-,lāt] -vi
- to breathe rapidly and deeply : undergo hyperventilation
hy·per·ven·ti·la·tion [-,ven-tə-'lā-shən] -n
- excessive rate and depth of respiration leading to abnormal loss of carbon dioxide from the blood
hy·per·vi·ta·min·osis [-,vī-tə-mə-'nō-səs] -n
- an abnormal state resulting from excessive intake of one or more vitamins
hy·pha ['hī-fə] -n, adj
- one of the threads that make up the mycelium of a fungus, increase by apical growth, and are transversely septate or nonseptate
hy·phen ['hī-fən] -n, adj
- a punctuation mark - used esp. to divide or to compound words, word elements, or numbers
hyphen -vt
- hyphenate
hy·phen·ate ['hī-fə-,nāt] -vt, n
- to connect (as two words) or divide (as a word at the end of a line of print) with a hyphen
hyphenate -n
- a person who performs more than one function (as a producer-director in filmmaking)
hyphenated -adj
- of, relating to, or being an individual or unit of mixed or diverse background or composition
hypn- -comb form
- sleep
- hypnotism
hyp·na·go·gic [,hip-nə-'gä-jik, -'gō-] -adj
- of, relating to, or occurring in the period of drowsiness immediately preceding sleep
- hypnagogic hallucinations
hyp·noid ['hip-,nȯid] -adj
- of or relating to sleep or hypnosis
hyp·no·pom·pic [,hip-nə-'päm-pik] -adj
- associated with the semiconsciousness preceding waking
Hyp·nos ['hip-nəs, -,nōs] -n
- the Greek god of sleep
hyp·no·sis [hip-'nō-səs] -n
- a trancelike state that resembles sleep but is induced by a person whose suggestions are readily accepted by the subject
- any of various conditions that resemble sleep
- hypnotism
hyp·no·ther·a·py [,hip-nō-'ther-ə-pē] -n
- treatment by hypnotism
- psychotherapy that facilitates suggestion, reeducation, or analysis by hypnosis
hyp·not·ic [hip-'nä-tik] -adj, adv
- tending to produce sleep : soporific
- of or relating to hypnosis or hypnotism
- readily holding the attention
hypnotic -n
- a sleep-inducing agent : soporific
- one that is or can be hypnotized
hyp·no·tism ['hip-nə-,ti-zəm] -n
- the study or act of inducing hypnosis
- hypnosis
hyp·no·tize [-,tīz] -vt, n, adj
- to induce hypnosis in
- to dazzle or overcome by or as if by suggestion
- a voice that hypnotize s its hearers
- drivers hypnotized by speed
hy·po ['hī-(,)pō] -n
- hypochondria
hypo -n
- sodium thiosulfate
- a solution of sodium thiosulfate
- hypodermic syringe
- hypodermic injection
- stimulus
- stimulate
- do everything possible to hypo the economy -- Clem Morgello
hypo- -prefix
- under : beneath : down
- less than normal or normally
- in a lower state of oxidation : in a low and usu. the lowest position in a series of compounds
hy·po·al·ler·gen·ic [,hī-pō-,a-lər-'je-nik] -adj
- having little likelihood of causing an allergic response
hy·po·blast ['hī-pə-,blast] -n
- the endoderm of an embryo
hy·po·cal·ce·mia [,hī-pō-,kal-'sē-mē-ə] -n, adj
- a deficiency of calcium in the blood
hy·po·caust ['hī-pə-,kȯst] -n
- an ancient Roman central heating system with underground furnace and tile flues to distribute the heat
hy·po·cen·ter ['hī-pə-,sen-tər] -n, adj
- the focus of an earthquake
- the point on the earth's surface directly below the center of a nuclear bomb explosion
hy·po·chlo·rite [,hī-pə-'klȯr-,īt] -n
- a salt or ester of hypochlorous acid
hy·po·chlo·rous acid [,hī-pə-'klȯr-əs-] -n
- an unstable strongly oxidizing but weak acid HClO obtained in solution along with hydrochloric acid by reaction of chlorine with water and used esp. in the form of salts as an oxidizing agent, bleaching agent, disinfectant, and chlorinating agent
hy·po·chon·dria [,hī-pə-'kän-drē-ə] -n
- extreme depression of mind or spirits often centered on imaginary physical ailments
- hypochondriasis
hy·po·chon·dri·ac [-drē-,ak] -adj
- hypochondriacal
- of, relating to, or being the two regions of the abdomen lying on either side of the epigastric region and above the lumbar regions
hypochondriac -n
- one affected by hypochondria
hy·po·chon·dri·a·cal [-kən-'drī-ə-kəl, -,kän-] -adj, adv
- affected or produced by hypochondria
hy·po·chon·dri·a·sis [-'drī-ə-səs] -n
- morbid concern about one's health esp. when accompanied by delusions of physical disease
hy·po·chro·mic [,hī-pə-'krō-mik] -adj
- marked by or being red blood cells with deficient hemoglobin
hy·po·co·rism [hī-'pä-kə-,ri-zəm; ,hī-pə-'kȯr-,i-] -n, adj, adv
- a pet name
- the use of pet names
hy·po·cot·yl ['hī-pə-,kä-tᵊl] -n
- the part of the axis of a plant embryo or seedling below the cotyledon
hy·poc·ri·sy [hi-'pä-krə-sē also hī-] -n
- a feigning to be what one is not or to believe what one does not
- the false assumption of an appearance of virtue or religion
- an act or instance of hypocrisy
hyp·o·crite ['hi-pə-,krit] -n, adj
- a person who puts on a false appearance of virtue or religion
- a person who acts in contradiction to his or her stated beliefs or feelings
hyp·o·crit·i·cal [,hi-pə-'kri-ti-kəl] -adj, adv
- characterized by hypocrisy
- being a hypocrite
hy·po·cy·cloid [,hī-pō-'sī-,klȯid] -n
- a curve traced by a point on the circumference of a circle rolling internally on the circumference of a fixed circle
hy·po·der·mal [,hī-pə-'dər-məl] -adj
- of or relating to a hypodermis
- lying beneath an outer skin or epidermis
hy·po·der·mic [-mik] -adj, adv
- adapted for use in or administered by injection beneath the skin
- of or relating to the parts beneath the skin
- resembling a hypodermic injection in effect : stimulating
hypodermic -n
- hypodermic injection
- hypodermic syringe
hypodermic injection -n
- an injection made into the subcutaneous tissues
hypodermic needle -n
- needle
- a hypodermic syringe complete with needle
hypodermic syringe -n
- a small syringe used with a hollow needle for injection of material into or beneath the skin
hy·po·der·mis [,hī-pə-'dər-məs] -n
- the tissue immediately beneath the epidermis of a plant esp. when modified to serve as a supporting and protecting layer
- the cellular layer that underlies and secretes the chitinous cuticle (as of an arthropod)
- superficial fascia
hy·po·dip·loid [,hī-pō-'di-,plȯid] -adj, n
- having slightly fewer than the diploid number of chromosomes
hy·po·eu·tec·toid [,hī-pō-yu̇-'tek-,tȯid] -adj
- containing less of the minor component than is contained in the eutectoid
hy·po·gas·tric [,hī-pə-'gas-trik] -adj
- of or relating to the lower median region of the abdomen
hy·po·ge·al [,hī-pə-'jē-əl] -adj
- growing or living below the surface of the ground
- remaining below the ground while the epicotyl elongates
hy·po·gene ['hī-pə-,jēn] -adj
- formed, crystallized, or lying at depths below the earth's surface : plutonic used of various rocks
hy·po·ge·um [,hī-pə-'jē-əm] -n
- the subterranean part of an ancient building
- an ancient underground burial chamber
hy·po·glos·sal [,hī-pə-'glä-səl] -adj
- of or relating to the hypoglossal nerves
hypoglossal nerve -n
- either of the 12th and final pair of cranial nerves which are motor nerves arising from the medulla oblongata and supplying muscles of the tongue in higher vertebrates called also hypoglossal
hy·po·gly·ce·mia [,hī-pō-glī-'sē-mē-ə] -n, adj or n
- abnormal decrease of sugar in the blood
hy·pog·y·nous [hī-'pä-jə-nəs] -adj, n
- inserted upon the receptacle or axis below the gynoecium and free from it
- having hypogynous floral organs
hy·po·ka·le·mia [,hī-pō-,kā-'lē-mē-ə] -n, adj
- a deficiency of potassium in the blood
hy·po·lim·ni·on [,hī-pō-'lim-nē-,än, -nē-ən] -n
- the part of a lake below the thermocline made up of water that is stagnant and of essentially uniform temperature except during the period of overturn
hy·po·mag·ne·se·mia [,hī-pə-,mag-nə-'sē-mē-ə] -n
- deficiency of magnesium in the blood
hy·po·ma·nia [,hī-pə-'mā-nē-ə, -nyə] -n, adj
- a mild mania esp. when part of bipolar disorder
hy·po·para·thy·roid·ism ['hī-pō-,pa-rə-'thī-,rȯi-,di-zəm] -n
- deficiency of parathyroid hormone in the body
- the resultant abnormal state marked by low serum calcium and a tendency to chronic tetany
hy·po·phar·ynx [-'fer-iŋ(k)s] -n
- an appendage or thickened fold on the floor of the mouth of many insects that resembles a tongue
- the laryngeal part of the pharynx extending from the hyoid bone to the lower margin of the cricoid cartilage
hy·po·phy·se·al [(,)hī-,pä-fə-'sē-əl, ,hī-pə-, -'zē-; ,hī-pə-'fi-zē-əl] -adj
- of or relating to the hypophysis
hy·poph·y·sec·to·mize [(,)hī-,pä-fə-'sek-tə-,mīz] -vt
- to remove the pituitary gland from
hy·poph·y·sec·to·my [-mē] -n
- surgical removal of the pituitary gland
hy·poph·y·sis [hī-'pä-fə-səs] -n
- pituitary gland
hy·po·pi·tu·ita·rism [,hī-pō-pə-'tü-ə-tə-,ri-zəm, -'tü-ə-,tri-, -'tyü-] -n, adj
- deficient production of growth hormones by the pituitary gland
hy·po·pla·sia [-'plā-zh(ē-)ə] -n, adj
- a condition of arrested development in which an organ or part remains below the normal size or in an immature state
hy·po·ploid ['hī-pō-,plȯid] -adj, n
- having a chromosome number slightly less than an exact multiple of the monoploid number
hy·po·sen·si·ti·za·tion [,hī-pō-,sen(t)-sə-tə-'zā-shən, -,sen(t)-stə-'zā-] -n, vt
- the state or process of being reduced in sensitivity esp. to an allergen : desensitization
hy·po·spa·di·as [,hī-pə-'spā-dē-əs] -n
- an abnormality of the penis in which the urethra opens on the undersurface
hy·pos·ta·sis [hī-'päs-tə-səs] -n, adj, adv
- something that settles at the bottom of a fluid
- the settling of blood in the dependent parts of an organ or body
- person
- the substance or essential nature of an individual
- something that is hypostatized
- failure of a gene to produce its usual effect when coupled with another gene that is epistatic toward it
hy·pos·ta·tize [hī-'päs-tə-,tīz] -vt, n
- to attribute real identity to (a concept)
hy·po·stome ['hī-pə-,stōm] -n
- : any of several structures associated with the mouth: as
- the manubrium of a hydrozoan
- a rodlike organ that arises at the base of the beak in various mites and ticks
hy·po·style ['hī-pə-,stī(-ə)l] -adj, n
- having the roof resting on rows of columns
hy·po·tac·tic [,hī-pə-'tak-tik] -adj
- of or relating to hypotaxis
hy·po·tax·is [-'tak-səs] -n
- syntactic subordination (as by a conjunction)
hy·po·ten·sion [,hī-pō-'ten(t)-shən] -n
- abnormally low blood pressure
hy·po·ten·sive [,hī-pō-'ten(t)-siv] -adj
- characterized by or due to hypotension
- causing low blood pressure or a lowering of blood pressure
hypotensive -n
- a person with hypotension
hy·pot·e·nuse [hī-'pä-tə-,nüs, -,nyüz] -n
- the side of a right-angled triangle that is opposite the right angle
- the length of a hypotenuse
hy·po·tha·lam·ic [,hī-pō-thə-'la-mik] -adj
- of or relating to the hypothalamus
hy·po·thal·a·mus [-'tha-lə-məs] -n
- a basal part of the diencephalon that lies beneath the thalamus on each side, forms the floor of the third ventricle, and includes vital autonomic regulatory centers
hy·poth·e·cate [hi-'pä-thə-,kāt, hī-] -vt, n
- to pledge as security without delivery of title or possession
- hypothesize
hy·po·ther·mal [,hī-pō-'thər-məl] -adj
- of or relating to a hydrothermal metalliferous ore vein deposited at high temperature
hy·po·ther·mia [-'thər-mē-ə] -n, adj
- subnormal temperature of the body
hy·poth·e·sis [hī-'pä-thə-səs] -n
- an assumption or concession made for the sake of argument
- an interpretation of a practical situation or condition taken as the ground for action
- a tentative assumption made in order to draw out and test its logical or empirical consequences
- the antecedent clause of a conditional statement
hy·poth·e·size [-,sīz] -vb
- to make a hypothesis
- to adopt as a hypothesis
hy·po·thet·i·cal [,hī-pə-'the-ti-kəl] -adj, n, adv
- being or involving a hypothesis : conjectural
hy·po·thet·i·code·duc·tive [,hī-pə-'the-ti-,kō-di-'dək-tiv] -adj
- relating to, being, or making use of the method of proposing hypotheses and testing their acceptability or falsity by determining whether their logical consequences are consistent with observed data
hy·po·thy·roid [,hī-pō-'thī-,rȯid] -adj
- of, relating to, or affected with hypothyroidism
hy·po·thy·roid·ism [-,rȯi-,di-zəm] -n
- deficient activity of the thyroid gland
- a resultant bodily condition characterized by lowered metabolic rate and general loss of vigor
hy·po·to·nia [,hī-pə-'tō-nē-ə, -pō-] -n
- the state of having hypotonic muscle tone
hy·po·ton·ic [,hī-pə-'tä-nik, -pō-] -adj, n
- having deficient tone or tension
- having a lower osmotic pressure than a surrounding medium or a fluid under comparison
hy·po·xan·thine [,hī-pō-'zan-,thēn] -n
- a purine base C 5H 4N 4O found in plant and animal tissues that yields xanthine on oxidation
hyp·ox·emia [,hi-,päk-'sē-mē-ə, ,hī-] -n, adj
- deficient oxygenation of the blood
hyp·ox·ia [hi-'päk-sē-ə, hī-] -n, adj
- a deficiency of oxygen reaching the tissues of the body
hyp·som·e·ter [hip-'sä-mə-tər] -n
- any of various instruments for determining the height of trees by triangulation
hyp·so·met·ric [,hip-sə-'me-trik] -adj
- of, relating to, or indicating elevation (as on a map)
hy·rax ['hī-,raks] -n
- any of a family (Procaviidae) of small ungulate mammals of Africa and the Middle East characterized by thickset body with short legs and ears and rudimentary tail, feet with soft pads and broad nails, and teeth of which the molars resemble those of the rhinoceros and the incisors those of rodents called also coney dassie
hy·son ['hī-sᵊn] -n
- a Chinese green tea made from thinly rolled and twisted leaves
hys·sop ['hi-səp] -n
- a plant used in purificatory sprinkling rites by the ancient Hebrews
- a European mint ( Hyssopus officinalis) that has highly aromatic and pungent leaves and is sometimes used as a potherb
hyster- -comb form
- womb
hys·ter·ec·to·my [,his-tə-'rek-tə-mē] -n, adj
- surgical removal of the uterus
hys·ter·e·sis [,his-tə-'rē-səs] -n, adj
- a retardation of an effect when the forces acting upon a body are changed (as if from viscosity or internal friction)
- a lagging in the values of resulting magnetization in a magnetic material (as iron) due to a changing magnetizing force
hys·te·ria [his-'ter-ē-ə, -'tir-] -n, adj, adv
- a psychoneurosis marked by emotional excitability and disturbances of the psychic, sensory, vasomotor, and visceral functions
- behavior exhibiting overwhelming or unmanageable fear or emotional excess
hys·ter·ics [-'ter-iks] -n pl but sing or pl in constr
- a fit of uncontrollable laughter or crying
hys·ter·oid ['his-tə-,rȯid] -adj
- resembling or tending toward hysteria
hys·ter·on prot·er·on [,his-tə-,rän-'prä-tə-,rän, -tə-rən-'prä-tə-rən, -'prȯ-] -n
- a figure of speech consisting of the reversal of a natural or rational order (as in then came the thunder and the lightning)
hys·ter·o·sal·pin·go·gram [,his-tə-rō-,sal-'piŋ-gə-,gram] -n
- a radiograph made by hysterosalpingography
hys·ter·o·sal·pin·gog·ra·phy [,his-tə-rō-,sal-piŋ-'gäg-rə-fē] -n
- examination of the uterus and fallopian tubes by radiography after injection of an opaque medium
hys·ter·o·scope ['his-tə-rō-,skōp] -n
- an endoscope used for hysteroscopy
hys·ter·os·co·py [,his-tə-'räs-kə-pē] -n, adj
- visual examination of the cervix and interior of the uterus with an endoscope
hys·ter·ot·o·my [,his-tə-'rä-tə-mē] -n
- surgical incision of the uterus
- cesarean section