O Set2

omnivorous	adj. (of animals) eating both plants and animal flesh
onerous	adj. needing effort; burdensome
onomatopoeia	n. combination of sounds in a word that imitates or suggests what the word refers to eg hiss, cuckoo, thud ; hiss cuckoo thud
onslaught	n. ~ fierce attack
onus	n. the onus duty or responsibility (for doing sth); burden
ooze	v. ~ from/out of sth; ~ out/away come or flow out slowly
opalescent	adj. changing colour like an opal; iridescent
opaque	adj. not allowing light to pass through; not transparent
opiate	n. drug containing opium, used to relieve pain or to help sb sleep
opportune	adj. (of time) suitable or favourable for a purpose
opportunist	n. person who acts like this
opprobrium	n. public disgrace and shame
optician	n. person who makes and sells optical instruments, esp contact lenses and glasses
optimist	n. person who is always hopeful and expects the best in all things
optimum	adj. best or most favourable
optional	adj. that may be chosen or not, as one wishes; not compulsory
optometrist	one who fits glasses to remedy visual defects
opulence	n. opulently
opus	n. musical composition numbered as one of a composer's works (work1 5b) (usu in order of publication)
oracular	adj. of or like an oracle; with hidden meaning
orator	n. person who makes formal speeches in public
oratorio	n. musical composition for solo voices, chorus and orchestra,usu with a Biblical theme
ordain	v. make a priest or minister
ordeal	n. difficult or painful experience
ordinance	n. order, rule or law made by a government or an authority
ordination	n. ceremony of ordaining (a priest or minister)
orgy	n. wild party, usu with a lot of drinking and/or sexual activity
orient	n. the Orient countries of the (Far) East (eg Japan, China)
orientation	n. activity of orientating oneself; state of being orientated
orifice	n. outer opening in the body, etc
ornate	adj. richly decorated
ornithologist	n. expert in ornithology
orthodox	adj. generally accepted or approved
orthography	n. (study or system of) spelling
oscillate	v. move repeatedly and regularly from one position to another and back again
osseous	adj. of bone; having bones; bony ;
ossify	v. (fml ) (cause sth to) become hard like bone; change into bone ;
ostensible	adj. stated though perhaps not true; apparent
ostentatious	adj. showing or liking ostentation
ostracize	exclude from public favor; ban
oust	v. ~ sb (fml ) remove sb (from a position, job, etc) sometimes in order to take his place
outcast	n, adj ~ (person) driven away from home, friends, society, etc; homeless and friendless (person)
outfit	n. all the equipment or articles needed for a particular purpose; kit
outgoing	adj. going out; leaving
outlandish	adj. looking or sounding strange
outlaw	n. person who has broken the law and is hiding to avoid being caught
outlook	n. ~ view on which one looks out
outmoded	adj. no longer fashionable
outrage	n. (act of) great violence or cruelty
outskirts	n. outlying districts (esp of a city or large town); outer areas
outspoken	adj. ~ saying openly exactly what one thinks; frank
outstrip	v. run faster than (sb in a race) and leave him behind
outwit	v. win or defeat (sb) by being cleverer or more cunning than him
ovation	n. great applause or cheering expressing welcome or approval
overbearing	adj. forcing others to do what one wants (without caring about their feelings); domineering
overblown	adj. past their best; too fully open
overhaul	v. examine carefully and thoroughly and make any necessary repairs
oversee	v. watch over and control (sb/sth); supervise
overt	adj. done or shown openly or publicly; not secret or hidden
overthrow	v. cause the downfall or defeat of (sb/sth); put an end to
overture	n. ~ (fml ) friendly approach, proposalor offer made (to sb) with the aim of starting discussions
overturn	v. turn over or upside-down; upset
overweening	adj. showing too much self-confidence or conceit
overwhelm	v. cover (sth/sb) completely by flowing over or pouring down on it/him; submerge suddenly
overwrought	adj. in a state of nervous excitement, anxiety, etc; tense and upset
ovoid	adj. n egg-shaped (object)