/ Dictionary / Index O opticist: Meaning and Definition of Find definitions for: op•ti•cist Pronunciation: (op'tu-sist), [key] — n. Now Rare. a person engaged in the fields of theoretical or applied optics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. optician optic nerve Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language