/ Dictionary / Index P platinic acid: Meaning and Definition of Find definitions for: platin'ic ac'id Pronunciation: [key] — Chem. Chem. a white, crystalline, water-insoluble powder, HPtO, used chiefly in platinization. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. platinic platinic chloride Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language