om ['ōm] -n

  1. a mantra consisting of the sound om and used in contemplation of ultimate reality

OM -abbr

  1. order of merit

Oma·ha ['ō-mə-,hȯ, -,hä] -n

  1. a member of an American Indian people of northeastern Nebraska
  2. the Siouan language of the Omaha

oma·sum [ō-'mā-səm] -n

  1. the third chamber of the ruminant stomach that is situated between the reticulum and the abomasum

OMB -abbr

  1. Office of Management and Budget

om·bre ['äm-bər; 'äm-brē, 'əm-, -,brā] -n

  1. an old three-handed card game popular in Europe esp. in the 17th and 18th centuries
  2. having colors or tones that shade into each other used esp. of fabrics in which the color is graduated from light to dark

om·buds·man ['äm-,bu̇dz-mən, 'ȯm-, -bədz-, -,man; äm-'bu̇dz-, ȯm-] -n

  1. a government official (as in Sweden or New Zealand) appointed to receive and investigate complaints made by individuals against abuses or capricious acts of public officials
  2. one that investigates, reports on, and helps settle complaints

om·buds·per·son [-,pər-sᵊn] -n

  1. ombudsman

ome·ga [ō-'mā-gə, -'mē-, -'me-] -n

  1. the 24th and last letter of the Greek alphabet
  2. the extreme or final part : end
  3. a negatively charged elementary particle that has a mass 3270 times the mass of an electron called also omega minus
  4. a very short-lived unstable meson with mass 1532 times the mass of an electron called also omega meson

ome·ga3 [-'thrē] -adj

  1. being or composed of polyunsaturated fatty acids that have the final double bond in the hydrocarbon chain between the third and fourth carbon atoms from the end of the molecule opposite that of the carboxyl group and that are found esp. in fish, fish oils, green leafy vegetables, and some nuts and vegetable oils

om·e·let ['äm-lət, 'ä-mə-] -n

  1. beaten eggs cooked without stirring until set and served folded in half

omen ['ō-mən] -n

  1. an occurrence or phenomenon believed to portend a future event : augury

omen·tum [ō-'men-təm] -n, adj

  1. a fold of peritoneum connecting or supporting abdominal structures (as the stomach and liver)
  2. a fold of peritoneum free at one end

omep·ra·zole [ō-'me-prə-,zōl, -'mē-, -,zȯl] -n

  1. a benzimidazole derivative C 17H 19N 3O 3S that inhibits gastric acid secretion

omer ['ō-mər] -n

  1. an ancient Hebrew unit of dry capacity equal to ephah
  2. the sheaf of barley traditionally offered in Jewish Temple worship on the second day of the Passover
  3. a 7-week liturgical period of anticipation for Shabuoth beginning with the second day of the Passover

OMG -abbr

  1. oh my God

om·i·cron ['ä-mə-,krän, 'ō-, Brit ō-'mī-(,)krän] -n

  1. the 15th letter of the Greek alphabet

om·i·nous ['ä-mə-nəs] -adj, adv, n

  1. being or exhibiting an omen : portentous
  2. foreboding or foreshadowing evil : inauspicious

omis·si·ble [ō-'mi-sə-bəl] -adj

  1. that may be omitted

omis·sion [ō-'mi-shən, ə-] -n

  1. something neglected or left undone
  2. apathy toward or neglect of duty
  3. the act of omitting : the state of being omitted

omit [ō-'mit, ə-] -vt

  1. to leave out or leave unmentioned
    • omit s one important detail
  2. to leave undone : fail
  3. disregard
  4. give up

om·ma·tid·i·um [,ä-mə-'ti-dē-əm] -n, adj

  1. one of the elements corresponding to a small simple eye that make up the compound eye of an arthropod

omni- -comb form

  1. all : universally
    • omni directional

om·ni·bus ['äm-ni-(,)bəs] -n

  1. a usu. automotive public vehicle designed to carry a large number of passengers : bus
  2. a book containing reprints of a number of works

omnibus -adj

  1. of, relating to, or providing for many things at once
  2. containing or including many items
    • an omnibus bill

om·ni·com·pe·tent [,äm-ni-'käm-pə-tənt] -adj, n

  1. able to handle any situation
  2. having the authority or legal capacity to act in all matters

om·ni·di·rec·tion·al [,äm-ni-də-'rek-shnəl, -,nī-, -(,)dī-, -shə-nᵊl] -adj

  1. being in or involving all directions
  2. receiving or sending radio waves equally well in all directions
    • omnidirectional antenna

om·ni·far·i·ous [,äm-nə-'fer-ē-əs] -adj

  1. of all varieties, forms, or kinds
    • omnifarious interests

om·nif·i·cent [äm-'ni-fə-sənt] -adj

  1. unlimited in creative power

om·nip·o·tence [äm-'ni-pə-tən(t)s] -n

  1. the quality or state of being omnipotent
  2. an agency or force of unlimited power

om·nip·o·tent [-tənt] -adj, adv

  1. almighty
  2. having virtually unlimited authority or influence
    • an omnipotent ruler
  3. arrant

omnipotent -n

  1. one who is omnipotent
  2. god

om·ni·pres·ence [,äm-ni-'pre-zᵊn(t)s] -n

  1. the quality or state of being omnipresent : ubiquity

om·ni·pres·ent [-zᵊnt] -adj

  1. present in all places at all times

om·ni·range ['äm-ni-,rānj] -n

  1. a system of radio navigation in which any bearing relative to a special radio transmitter on the ground may be chosen and flown by an airplane pilot called also omnidirectional range

om·ni·science [äm-'ni-shən(t)s] -n

  1. the quality or state of being omniscient

om·ni·scient [-shənt] -adj, adv

  1. having infinite awareness, understanding, and insight
  2. possessed of universal or complete knowledge

om·ni·umgath·er·um [,äm-nē-əm-'ga-thə-rəm] -n

  1. a miscellaneous collection (as of things or persons)

om·ni·vore ['äm-ni-,vȯr] -n

  1. one that is omnivorous

om·niv·o·rous [äm-'niv-rəs, -'ni-və-] -adj, adv

  1. feeding on both animal and vegetable substances
  2. avidly taking in everything as if devouring or consuming
    • an omnivorous reader

om·pha·los ['äm(p)-fə-,läs, -ləs] -n

  1. a central point : hub, focal point

om·pha·lo·skep·sis [,äm(p)-fə-lō-'skep-səs] -n

  1. contemplation of one's navel as an aid to meditation
  2. inertia