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operator someone who controls the working of a machine or the activities of a business. [2 definitions]
operetta a short, funny opera, with words that are spoken as well as sung.
ophthalmologist a doctor who works in the branch of medicine that studies and treats diseases of the eye.
ophthalmology the branch of medicine that studies and treats diseases of the eye.
opinion what one thinks about something or somebody; viewpoint. An opinion is not necessarily based on facts. Feelings and experiences usually help a person form an opinion. [3 definitions]
opossum a small mammal with gray fur, a pointed nose, and a long tail, which it uses to hang from tree branches. The common opossum is the only marsupial that lives in North America. Several other kinds of opossums live in Central and South America. The female opossum carries her young in a pouch in her belly. [2 definitions]
opponent one who fights, plays, or takes a position against another.
opportunity a chance for a better situation. [2 definitions]
oppose to think, act, or be against; resist. [2 definitions]
opposite located at or on the sides across from each other; facing. [4 definitions]
opposition the act or state of being against, or the state of having someone against another. [3 definitions]
oppress to treat in a way that is cruel or not fair. [2 definitions]
opt to decide; choose (usually followed by "for" or an infinitive).
optical of or having to do with the sense of sight or the eye. [2 definitions]
optician a person who makes or sells eyeglasses and contact lenses.
optimistic likely to be hopeful that things will work out well.
option the right, power, or freedom to choose. [2 definitions]
optional left to someone's choice; not required.
optometrist a person who is trained to examine people's eyes and to fit them with eyeglasses or contact lenses.
-or1 See -er1
OR1 an abbreviation for Oregon. [2 definitions]