/ Dictionary / Index P phosgene: Meaning and Definition of Find definitions for: phos•gene Pronunciation: (fos'jēn, foz'-), [key] — n. Chem. a poisonous, colorless, very volatile liquid or suffocating gas, COCl, a chemical-warfare compound: used chiefly in organic synthesis. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: phosgene (Thesaurus) -phorous phosgenite Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language