barium sulphate

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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