Noun barium sulphate has 2 senses
  1. barium sulphate, barium sulfate, blanc fixe - a white insoluble radiopaque powder used as a pigment
    --1 is a kind of sulfate, sulphate
  2. heavy spar, barite, barytes, barium sulphate - a white or colorless mineral (BaSO4); the main source of barium
    --2 is a kind of mineral
    --2 has substances: barium, Ba, atomic number 56
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