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bar'ium sul'fate

a white, crystalline, water-insoluble powder, BaSO4, 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 stearatebarium sulfide
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