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-opsy examination; scrutiny.
opt to decide; choose (usu. fol. by for or an infinitive).
optic of or concerning the eye or the sense of sight. [3 definitions]
optical of or concerning the sense of sight or the eye. [5 definitions]
optical disk a disk on which material such as information, pictures, or music is stored in the form of tiny depressions and from which it is retrieved or played by means of a laser scanner. [2 definitions]
optician a person who sells or manufactures eyeglasses, contact lenses, or other optical devices. .
optic nerve either one of the two nerves that connect the retinas of the eyes to the brain.
optics (used with a sing. verb) the science of sight and the properties of light.
optimal most wanted or desirable; producing or likely to produce the best result; optimum.
optimism the belief that everything will turn out well, or that there are good aspects of every situation. (Cf. pessimism.) [3 definitions]
optimist one who usually or in a specific instance expects a good outcome. (Cf. pessimist.) [2 definitions]
optimistic expecting or tending to expect favorable outcomes. [2 definitions]
optimum the situation, quantity, degree, or other condition that is most desirable. [2 definitions]
option the right, power, or freedom to choose. [4 definitions]
optional not required; left to one's choice.
optometrist one who practices optometry.
optometry the profession of examining eyes, diagnosing defects in eyesight, and prescribing corrective lenses or exercises.
opulence the condition of being opulent. [2 definitions]
opulent having or displaying wealth or richness. [2 definitions]
opus a work of fine or literary art, esp. a musical composition numbered to indicate its chronological place in the composer's works.
-or1 a variant of -er1.