barium sulphate

World English Dictionary
barium sulphate
 
n
Also called: blanc fixe a white insoluble fine dense powder, used as a pigment, as a filler for paper, rubber, etc, and in barium meals. Formula: BaSO4

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WordNet
barium sulphate

noun
1. a white insoluble radiopaque powder used as a pigment 
2. a white or colorless mineral (BaSO4); the main source of barium [syn: heavy spar
WordNet® 3.0, © 2006 by Princeton University.
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