/ Dictionary / Index B barium carbonate: Meaning and Definition of Find definitions for: bar'ium car'bonate Pronunciation: [key] — Chem. Chem. a white, poisonous, water-insoluble powder, BaCO, used chiefly in the manufacture of rodenticides, paints, and dyes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barium bromate barium chloride Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language