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-opia a condition or defect of vision or of the eye.
opiate any of a number of drugs containing or made from opium that induce calmness, stupor, or sleep, or relieve pain. [7 definitions]
opine to present or believe as one's own opinion. [2 definitions]
opinion what one thinks about a person or matter, esp. a judgment not necessarily based on fact alone. [5 definitions]
opinionated having definite and unchangeable opinions, often seemingly on all subjects.
opinionative of, like, or based on an opinion. [2 definitions]
opium an addictive drug derived from one variety of poppy, containing various narcotic substances, and producing calm, stupor, sleep, or relief from pain. [2 definitions]
opium poppy a Eurasian annual poppy having grayish-green leaves and bearing large white, red, pink, or purple flowers, and oily seeds, the unripe pods of which may be harvested for their opium-containing sap.
opossum any of a number of American marsupials that are active at night and live in trees. [2 definitions]
opossum shrimp a small shrimplike crustacean, the female of which carries her eggs in a pouch between the legs.
opp. abbreviation of "opposite."
opponent one who opposes; antagonist; foe.
opportune favorable or suitable, esp. in relation to time.
opportunism an act or the habitual practice of taking advantage of situations for one's own ends without considering principles or the effects on others.
opportunist one who tends to take advantage of situations to serve his or her own ends, especially without regard for others or of principles.
opportunistic seeking or taking advantage of situations to serve one's own ends, especially without regard for others or for principles.
opportunity a chance for an improved situation. [2 definitions]
opposable capable of being opposed or resisted. [2 definitions]
oppose to think, act, or be against; resist or obstruct. [3 definitions]
opposed not in favor of; against.
opposeless combined form of oppose.