/ Dictionary / Index B barium sulfate: Meaning and Definition of Find definitions for: bar'ium sul'fate Pronunciation: [key] — Chem. Chem. a white, crystalline, water-insoluble powder, BaSO, used chiefly in the synthesis of pigments, as in paints and printing inks, and, because of its radiopacity, for x-ray diagnosis in medicine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barium stearate barium sulfide Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language