operator |
one who controls functions, operations, or activities, as of machines or businesses. [4 definitions] |
operatorless |
combined form of operator. |
operculum |
in biology, an organ or organ part that serves as a lid, flap, or cover. |
operetta |
a short light, usu. humorous opera, often with dialogue that is spoken as well as sung. |
ophidian |
designating the biological suborder that comprises snakes. [2 definitions] |
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 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. |