| omasum | (noun) the third compartment of the stomach of a ruminant | Synonyms: psalterium, third stomach |
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| ombu | (noun) fast-growing herbaceous evergreen tree of South America having a broad trunk with high water content and dark green oval leaves | Synonyms: bella sombra, Phytolacca dioica |
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| ombudsman | (noun) a government appointee who investigates complaints by private persons against the government | - |
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| omega | (noun) the last (24th) letter of the Greek alphabet | - |
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| (noun) the ending of a series or sequence | Synonyms: Z |
| omelet | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelette |
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| omelette | (noun) beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly | Synonyms: omelet |
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| omen | (noun) a sign of something about to happen | Synonyms: portent, presage, prodigy, prognostic, prognostication |
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| (verb) indicate, as with a sign or an omen | Synonyms: augur, auspicate, betoken, bode, forecast, foreshadow, foretell, portend, predict, prefigure, presage, prognosticate |
| omentum | (noun) a fold of peritoneum supporting the viscera | - |
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| omeprazole | (noun) antacid (trade name Prilosec) that suppresses acid secretion in the stomach | Synonyms: Prilosec |
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| omerta | (noun) a code of silence practiced by the Mafia; a refusal to give evidence to the police about criminal activities | - |
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| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| ominously | (adverb) in an ominous manner | - |
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| ominousness | (noun) The quality of giving indication of a coming ill; being an evil omen; being threatening, portentous, inauspicious. | - |
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| omissible | (adjective) capable of being left out | - |
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| omission | (noun) a mistake resulting from neglect | Synonyms: skip |
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| (noun) neglecting to do something; leaving out or passing over something | - |
| (noun) any process whereby sounds or words are left out of spoken words or phrases | Synonyms: deletion |
| (noun) something that has been omitted | - |
| omissive | (adjective) characterized by omissions | - |
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| omit | (verb) leave undone or leave out | Synonyms: drop, leave out, miss, neglect, overleap, overlook, pretermit |
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| (verb) prevent from being included or considered or accepted | Synonyms: except, exclude, leave off, leave out, take out |
| ommastrephes | (noun) extremely active cylindrical squid with short strong arms and large rhombic terminal fins | - |
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| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| omnibus | (adjective) providing for many things at once | - |
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| (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |
| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnipotence | (noun) the state of being omnipotent; having unlimited power | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresence | (noun) the state of being everywhere at once (or seeming to be everywhere at once) | Synonyms: ubiquitousness, ubiquity |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omnirange | (noun) a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing | Synonyms: omnidirectional radio range, omnidirectional range |
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| omniscience | (noun) the state of being omniscient; having infinite knowledge | - |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| omnivore | (noun) an animal that feeds on both animal and vegetable substances | - |
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| (noun) a person who eats all kinds of foods | - |
| omnivorous | (adjective) feeding on both plants and animals | - |
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| omnivorousness | (noun) The state of eating both animal and plant matter. | - |
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| omophagia | (noun) the eating of raw food | - |
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| omphalocele | (noun) protrusion of the intestine and omentum through a hernia in the abdominal wall near the navel; usually self correcting after birth | Synonyms: umbilical hernia |
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| omphalos | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalus, umbilicus |
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| omphaloskepsis | (noun) literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption | Synonyms: navel-gazing |
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| omphalus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, umbilicus |
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