/ Dictionary / Index B barium sulfide: Meaning and Definition of Find definitions for: bar'ium sul'fide Pronunciation: [key] — Chem. Chem. a gray or yellowish-green, water-soluble, poisonous powder, BaS, used chiefly as a depilatory and as an intermediate in the synthesis of pigments, esp. lithopone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barium sulfate barium thiosulfate 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