/ Dictionary / Index D diphenyl: Meaning and Definition of Find definitions for: di•phen•yl Pronunciation: (dī-fen'l, -fēn'l), [key] — n. Chem. biphenyl. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphenoxylate diphenylacetylene Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language