/ Dictionary / Index O optic: Meaning and Definition of Find definitions for: op•tic Pronunciation: (op'tik), [key] — adj. of or pertaining to the eye or sight. optical. —n. the eye. a lens of an optical instrument. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: optic (Thesaurus) optative optical Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language