Definition of barium sulfate
: a crystalline insoluble compound BaSO4 that is used especially as a pigment and extender, as a filler (as in fluids used in gas and oil drilling), and as a substance opaque to X rays in medical photography of the alimentary canal
First Known Use of barium sulfate
Medical Definition of barium sulfate
: a colorless crystalline insoluble salt BaSO4 occurring in nature as barite and used medically chiefly as a radiopaque substance
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