/ Dictionary / Index P phenyl isocyanate: Meaning and Definition of Find definitions for: phen'yl isocy'anate Pronunciation: [key] — Chem. Chem. a liquid reagent, CHNO, having an unpleasant, irritating odor: used chiefly for identifying alcohols and amines. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phenylic acid phenylketonuria Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language