barium sulphate
1. a white or colorless mineral (BaSO4); the main source of barium • Syn: heavy spar, barite, barytes • Hypernyms: mineral • Substance Meronyms: barium, Ba, atomic number 56 2. a white insoluble radiopaque powder used as a pigment • Syn: barium sulfate, blanc fixe • Hypernyms: sulfate, sulphate
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