/ Dictionary / Index B barium thiosulfate: Meaning and Definition of Find definitions for: bar'ium thiosul'fate Pronunciation: [key] — Chem. Chem. a white, crystalline, water-insoluble, poisonous solid, BaSO&multiplydot;HO, used chiefly in the manufacture of explosives, matches, paints, and varnishes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barium sulfide barium titanate Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language