ophthalmoscope |
an instrument for examining the retina and the interior of the eyeball. |
-opia |
a condition or defect of vision or of the eye. |
opiate |
any of a number of drugs containing or derived from opium that induces calmness, stupor, or sleep, or relieves pain. [7 definitions] |
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] |