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ophiolatry the attribution of divine power to snakes; worship of snakes.
ophiology the branch of zoology that deals with snakes.
ophthalmia inflammation of one or more parts of the eye, esp. the conjunctiva.
ophthalmic of or concerning the eye.
ophthalmo- eye.
ophthalmologist a doctor who specializes in the study and treatment of eye diseases.
ophthalmology the medical study of the eye, its diseases, and their treatments.
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 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.