Io ['ī-(,)ō] -n
- a maiden loved by Zeus and changed by him into a heifer so that she might escape the jealous rage of Hera
IOC -abbr
- International Olympic Committee
iod- -comb form
- iodine
io·date ['ī-ə-,dāt, -dət] -n
- a salt containing the IO 3 ion
io·dide ['ī-ə-,dīd] -n
- a salt of hydriodic acid
- the monovalent anion I of such a salt
io·din·ate ['ī-ə-də-,nāt] -vt, n
- to treat or cause to combine with iodine or a compound of iodine
io·dine ['ī-ə-,dīn, -dᵊn, -,dēn] -n
- a nonmetallic halogen element obtained usu. as heavy shining blackish-gray crystals and used esp. in medicine, photography, and analysis
- a tincture of iodine used esp. as a topical antiseptic
io·dise ['ī-ə-,dīz] -vt
(variant of iodize)
- to treat with iodine or an iodide
io·dize ['ī-ə-,dīz] -vt
- to treat with iodine or an iodide
io·do·form [ī-'ō-də-,fȯrm, -'ä-] -n
- a yellow crystalline volatile compound CHI 3with a penetrating persistent odor that is used as an antiseptic dressing
io·do·phor [-,fȯr] -n
- a complex of iodine and a surface-active agent that releases iodine gradually and serves as a disinfectant
io·dop·sin [,ī-ə-'däp-sən] -n
- a photosensitive violet pigment in the retinal cones that is similar to rhodopsin but more labile, is formed from vitamin A, and is important in daylight vision
IOM -abbr
- Isle of Man
Io moth ['ī-(,)ō-] -n
- a chiefly No. American saturniid moth ( Automeris io) having a large circular eyelike spot on the upper surface of each hind wing and a green larva with stinging spines
ion ['ī-ən, 'ī-,än] -n
- an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons
- a charged subatomic particle (as a free electron)
Ion -abbr
- Ionic
ion channel -n
- a cell membrane channel that is selectively permeable to certain ions (as of calcium or sodium)
ion engine -n
- a reaction engine deriving thrust from the ejection of a stream of ionized particles
ion exchange -n
- a reversible interchange of one kind of ion present on an insoluble solid with another of like charge present in a solution surrounding the solid with the reaction being used esp. for softening or demineralizing water, the purification of chemicals, or the separation of substances
ion exchange resin -n
- an insoluble material of high molecular weight that contains groups which can be exchanged with ions in a solution with which it is in contact
Io·ni·an [ī-'ō-nē-ən] -n, adj
- a member of any of the Greek peoples who settled on the islands of the Aegean Sea and the western shore of Asia Minor toward the end of the second millennium b.c.
- a native or inhabitant of Ionia
ion·ic [ī-'ä-nik] -adj, n
- of, relating to, existing as, or characterized by ions
- based on or functioning by means of ions
Ion·ic [ī-'ä-nik] -adj
- of or relating to the ancient Greek architectural order distinguished esp. by fluted columns on bases and scroll volutes in its capitals
- of or relating to Ionia or the Ionians
Ionic -n
- a dialect of ancient Greek spoken esp. in Ionia and the Cyclades
ionic bond -n
- a chemical bond formed between oppositely charged species because of their mutual electrostatic attraction
ion·ise ['ī-ə-,nīz] -vb, adj, n
(variant of ionize)
- to convert wholly or partly into ions
- to become ionized
io·ni·um [ī-'ō-nē-əm] -n
- a natural radioactive isotope of thorium having a mass number of 230
ionization chamber -n
- a partially evacuated tube provided with electrodes so that its conductivity due to the ionization of the residual gas reveals the presence of ionizing radiation
ion·ize ['ī-ə-,nīz] -vb, adj, n
- to convert wholly or partly into ions
- to become ionized
ion·o·phore [ī-'ä-nə-,fȯr] -n
- a compound that facilitates transmission of an ion (as of calcium) across a lipid barrier (as in a cell membrane) by combining with the ion or by increasing the permeability of the barrier to it
ion·o·sphere [ī-'ä-nə-,sfir] -n, adj, adv
- the part of the earth's atmosphere in which ionization of atmospheric gases affects the propagation of radio waves, which extends from about 30 miles (50 kilometers) to the exosphere, and which is contiguous with the upper portion of the mesosphere and the thermosphere
- a comparable region of charged particles surrounding another celestial body (as Venus)
ion·to·pho·re·sis [(,)ī-,än-tə-fə-'rē-səs] -n, adj, adv
- the introduction of an ionized substance (as a drug) through intact skin by the application of a direct electric current
IOOF -abbr
- Independent Order of Odd Fellows
io·ta [ī-'ō-tə] -n
- the 9th letter of the Greek alphabet
- an infinitesimal amount : jot
- did not show an iota of interest
IOU [,ī-(,)ō-'yü] -n
- a paper that has on it the letters IOU, a stated sum, and a signature and that is given as an acknowledgment of debt
- debt, obligation
IOW -abbr
- Isle of Wight