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calcium    : [k'ælsiəm]
Calcium \Cal"ci*um\ (k[a^]l"s[i^]*[u^]m), n. [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.
[1913 Webster]

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.
[1913 Webster]

{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
[1913 Webster PJC]

n 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 [synonym:
{calcium}, {Ca}, {atomic number 20}]

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.

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