/ Dictionary / Index P potassium carbonate: Meaning and Definition of Find definitions for: potas'sium car'bonate Pronunciation: [key] — Chem. Chem. a white, granular, water-soluble powder, KCO, used chiefly in the manufacture of soap, glass, and potassium salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. potassium bromide potassium chlorate Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language