/ Dictionary / Index D diphenyl ketone: Meaning and Definition of Find definitions for: diphen'yl ke'tone Pronunciation: [key] — Chem. Chem. benzophenone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphenylhydantoin diphonia Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language