/ Dictionary / Index P phonon: Meaning and Definition of Find definitions for: pho•non Pronunciation: (fō'non), [key] — n. Physics. a quantum of sound or vibratory elastic energy, being the analogue of a photon of electromagnetic energy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phonometer phonoreception Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language