/ Dictionary / Index D diphosgene: Meaning and Definition of Find definitions for: di•phos•gene Pronunciation: (dī-fos'jēn), [key] — n. Chem. a colorless liquid, CClO, usually derived from methyl formate or methyl chloroformate by chlorination: a World War I poison gas now used chiefly in organic synthesis. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diphonia diphosphate 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