Definitions for: 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



Webster (1913) Definition: 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.

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.

Synonyms: atomic number 20, Ca

See Also: burnt lime, calcined lime, calcium ion, calcium oxide, calx, factor IV, fluor, fluorite, fluorspar, fluxing lime, gypsum, lime, limestone, metal, metallic element, quicklime, unslaked lime

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