/ Dictionary / Index I isocyanic acid: Meaning and Definition of Find definitions for: i'so•cy•an'ic ac'id Pronunciation: (ī'sō-sī-an'ik, ī"sō-), [key] — Chem. Chem. an unstable acid, CHNO, tautomeric with cyanic acid, known only in the form of its salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isocyanate isocyanide Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language