/ Dictionary / Index P photonic: Meaning and Definition of Find definitions for: pho•ton•ic Pronunciation: (fō-ton'ik), [key] — adj. of or pertaining to processes involving photons. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. photoneutron photonics Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language