ombre |ˈɒmbə| — A card game, borrowed from the Spaniards, and usually played by three persons; it involves forty cards, omitting the ranks of 8, 9 and 10.

ombrometer |ɒmˈbrɒmɪtə| — An instrument for measuring rainfall.

ombudsman |ˈɑːmbʊdzmən| — a government appointee who investigates complaints by private persons against the government

omega |əʊˈmeɡə| — the ending of a series or sequence

omelet |ˈɑːmlət| — beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly

omelette |ˈɑːmlət| — beaten eggs or an egg mixture cooked until just set; may be folded around e.g. ham or cheese or jelly

omen |ˈəʊmən| — a sign of something about to happen

ominous |ˈɑːmɪnəs| — threatening or foreshadowing evil or tragic developments

ominously |ˈɑːmɪnəslɪ| — in an ominous manner

omissible |əʊˈmɪsəbəl| — capable of being left out

omission |əˈmɪʃn| — a mistake resulting from neglect

omit |əˈmɪt| — prevent from being included or considered or accepted

omitted |əˈmɪtɪd| — simple past tense and past participle of omit

omnibus |ˈɑːmnɪbəs| — an anthology of articles on a related subject or an anthology of the works of a single author

omnidirectional |ˌɑːmnɪdəˈrekʃənl| — not directional

omnifarious |ɑːmnɪˈferiːəs| — of all varieties or forms or kinds

omniparity |ˈɒmnɪˈpærɪtɪ| — Equality in every part; general equality.

omnipotence |ɑːmˈnɪpətəns| — the state of being omnipotent; having unlimited power

omnipotent |ɑːmˈnɪpətənt| — having unlimited power

omnipresence |ˌɑːmnɪˈprezns| — the state of being everywhere at once (or seeming to be everywhere at once)

omnipresent |ˌɑːmnɪˈpreznt| — being present everywhere at once

omnirange |ˈɑːmnəreɪndʒ| — a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing

omniscience |ɑːmˈnɪsɪəns| — the state of being omniscient; having infinite knowledge

omniscient |ɑːmˈnɪsɪənt| — infinitely wise

omnivorous |ɑːmˈnɪvərəs| — feeding on both plants and animals

omphalocele |ˈɑːmfələʊsl| — protrusion of the intestine and omentum through a hernia in the abdominal wall near the navel; usually self correcting after birth

omphalos |ˈɑːmfələs| — a scar where the umbilical cord was attached

omul |ˈɒmjuːl| — A salmon-like species of fish, Coregonus autumnalis migratorius, native to Lake Baikal in Siberia