Barium Sulfate Definition

A fine white powder, BaSO4 , used as a pigment, as a filler for textiles, rubbers, and plastics, and as a contrast medium in x-ray photography of the digestive tract.
American Heritage
An odorless, tasteless, white powder, BaSO4, insoluble in water: it is used as a paint pigment, as a filler for paper, textiles, etc., and as an opaque substance that is ingested to aid in making diagnostic X-rays of the stomach and intestine.
Webster's New World

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barium sulfate