/ Dictionary / Index D diphenoxylate: Meaning and Definition of Find definitions for: di•phen•ox•y•late Pronunciation: (dī"fen-ok'su-lāt"), [key] — n. Pharm. a substance, CHNO, used in the form of its hydrochloride in the treatment of diarrhea. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphenhydramine diphenyl Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language