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calcium 音标拼音: [k'ælsiəm] n. 钙 钙 calcium 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}] 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 light}. [ 1913 Webster PJC] |
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