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opine to present or believe as one's own opinion. [2 definitions]
opinion what one thinks about a 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]
opioid any natural or synthetic compound, including heroin, morphine, and certain prescription pain relievers, that binds opioid receptors and has an analgesic or narcotic effect. [2 definitions]
opioid epidemic a rapid increase in the use of prescription and non-prescription opioid drugs, beginning in the late 1990s and continuing into the early decades of the 2000s.
opioid receptor any of a group of protein molecules that bind opioids, resulting in an inhibitory response.
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 that makes something possible or that may bring about some benefit. [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.