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Webster 1913 Edition
Calcium
Cal′ci-um
(kăl′sĭ-ŭm)
, Noun.
(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.
☞ 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.
Webster 1828 Edition
Calcium
CALCIUM
,Noun.