2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Calcium \Cal"ci*um\ (k[a^]l"s[i^]*[u^]m), noun [NL., from L. calx, calcis, lime; cf F. calcium. See {Calx}.] (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}. [1913 Webster +PJC]

From WordNet (r) 3.0 (2006) [wn]:



1: 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: {calcium}, {Ca}, {atomic number 20}]

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