CALCIUM

calcium, Ca, atomic number

(noun) 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

Source: WordNet® 3.1

Etymology

Noun

calcium (countable and uncountable, plural calciums)

The chemical element (Symbol Ca), with an atomic number 20. It is a soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks.

(countable) An atom of this element.

Source: Wiktionary

Cal"ci*um, n. Etym: [NL., from L. calx, calcis, lime; cf F. calcium. See Calx.] (Chem.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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