/ Dictionary / Index P photics: Meaning and Definition of Find definitions for: pho•tics Pronunciation: (fō'tiks), [key] — n. (used with a sing. v.) the science of light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photic photic zone Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language