| Term | Definition |
|---|
| obsolete | ADJ. outmoded |
| obstetrician | N. physician specializing in delivery of babies |
| obstinate | ADJ. stubborn; hard to control or treat |
| obstreperous | ADJ. boisterous; noisy |
| obtrude | V. push (oneself or one's ideas) forward or intrude; butt in; stick out or extrude |
| obtuse | ADJ. blunt; stupid |
| obviate | *V. make unnecessary; get rid of |
| Occident | N. the West |
| occlude | *V. shut; close |
| occult | ADJ. mysterious; secret; supernatural |
| oculist | N. physician who specializes in treatment of the eyes |
| odious | ADJ. hateful; vile |
| odium | N. detestation; hatefulness; disrepute |
| odoriferous | ADJ. giving off an odor |
| odorous | ADJ. having an odor |
| odyssey | N. long, eventful journey |
| offhand | ADJ. casual; done without prior tought |
| officious | *ADJ. meddlesome; excessively pushy in offering one's services |
| ogle | V. look at amorously; make eyes at |
| olfactory | ADJ. concerning the sense of smell |
| oligarchy | N. government by a privileged few |
| omnipotent | ADJ. all-powerful |
| omnipresent | ADJ. universally present; ubiquitous |
| omniscient | ADJ. all-knowing |
| onerous | *ADJ. burdensome |
| onslaught | N. vicious assault |
| onus | N. burden; responsibility |
| opalescent | ADJ. iridescent; lustrous |
| opaque | ADJ. dark; not transparent |
| opiate | N. medicine to induce sleep or deaden pain; something that relieves emotions or causes inaction |
| opportune | ADJ. timely; well-chosen |
| opportunist | N. individual who sacrifices principles for expediency by taking advantage of circumstances |
| opprobrium | N. infamy; vilification |
| optician | N. maker and seller of eyeglasses |
| optometrist | N. one who fits glasses to remedy visual defects |
| opulence | N. extreme wealth; luxuriousness; abundance |
| opus | N. work |
| oracular | ADJ. prophetic; uttered as if with divine authority; mysterious or ambiguous |
| orator | N. public speaker |
| oratorio | N. dramatic poem set to music |
| ordain | V. decree or command; grant holy orders; predestine |
| ordeal | N. severe trial or affliction |
| ordinance | N. decree |
| ordination | N. ceremony conferring holy orders |
| orgy | N. wild, drunken revelry; unrestrained indulgence |
| orient | V. get one's bearings; adjust |
| orientation | N. act of finding oneself in society |
| orifice | N. mouthlike opening; small opening |
| ornate | ADJ. excessively or elaborately decorated |
| ornithologist | N. scientific student of birds |
| orthodox | ADJ. traditional; conservative in belief |
| orthography | N. correct spelling |
| oscillate | *V. vibrate pendulumlike; waver |
| osseous | ADJ. made of bone; bony |
| ossify | V. change or harden into bone |
| ostensible | ADJ. apparent; professed; pretended |
| ostentatious | *ADJ. showy; pretentious; trying to attract attention |
| ostracize | V. exclude from public favor; ban |
| oust | V. expel; drive out |
| outlandish | ADJ. bizarre; peculiar; unconventional |
| outmoded | ADJ. no longer stylish; old-fashioned |
| outskirts | N. fringes; outer borders |
| outspoken | ADJ. candid; blunt |
| outstrip | V. surpass; outdo |
| outwit | V. outsmart; trick |
| ovation | N. enthusiastic applause |
| overbearing | ADJ. bossy; arrogant; decisively important |
| overt | ADJ. open to view |
| overweening | ADJ. presumptuous; arrogant |
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