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calcium (n.)

metallic element, coined 1808 by English chemist Sir Humphrey Davy, who first succeeded in isolating it, from Latin calx (genitive calcis) "limestone" (see chalk (n.)) + metallic element ending -ium. Related: Calcic.

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Definitions of calcium from WordNet

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;
Synonyms: Ca / atomic number "
From wordnet.princeton.edu