cal·ci·um /ˈkælsiəm/
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 cal·ci·um /ˈkælsɪəm/ 名詞
 Cal·ci·um n.  Chem. An elementary substance; a metal which combined with oxygen forms lime. It is of a pale yellow color, tenacious, and malleable. It is a member of the alkaline earth group of elements. Atomic weight 40. Symbol Ca.
 Note: ☞ Calcium is widely and abundantly disseminated, as in its compounds calcium carbonate or limestone, calcium sulphate or gypsum, calcium fluoride or fluor spar, calcium phosphate or apatite.
 Calcium light, an intense light produced by the incandescence of a stick or ball of lime in the flame of a combination of oxygen and hydrogen gases, or of oxygen and coal gas; -- called also Drummond light and lime light.
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 calcium
      n : a white metallic element that burns with a brilliant light;
          the fifth most abundant element in the earth's crust; an
          important component of most plants and animals [syn: Ca,
           atomic number 20]
 calcium
 Symbol: Ca
 Atomic number: 20
 Atomic weight: 40.08
 Soft grey metallic element belonging to group 2 of the periodic table.
 Used a reducing agent in the extraction of thorium, zirconium and
 uranium. Essential element for living organisms.