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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A silvery, moderately hard metallic element that constitutes approximately 3 percent of the earth's crust and is a basic component of most animals and plants. It occurs naturally in limestone, gypsum, and fluorite, and its compounds are used to make plaster, quicklime, Portland cement, and metallurgic and electronic materials. Atomic number 20; atomic weight 40.08; melting point 842 to 848°C; boiling point 1,487°C; specific gravity 1.55; valence 2. See Table at element.

Century Dictionary and Cyclopedia

  1. n. Chemical symbol, Ca; atomic weight, 40. A metal having a light-yellow color and brilliant luster, about as hard as gold, very ductile, and having a specific gravity of about 1.57. It oxidizes readily in moist air, and at a red heat burns vividly, forming calcium oxid, CaO, or quicklime, one of the alkaline earths. On adding water this forms calcium hydrate, Ca(OH)2 or slaked lime. Calcium is not found native in the metallic state, but it unites with most of the non-metallic elements in compounds which are widely distributed in nature and extensively used. The mineral calcite, all limestone or marble, and the chalk deposits are calcium carbonate; gypsum is calcium sulphate; and calcium also enters into the composition of nearly all the native silicates.
  2. n. A calcium light.

Wiktionary

  1. n. A chemical element, atomic number 20, that is an alkaline earth metal and occurs naturally as carbonate in limestone and as silicate in many rocks.

GNU Webster's 1913

  1. n. (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.

WordNet 3.0

  1. 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

Etymologies

  1. A New Latin word derived by Sir Humphry Davy in 1808, from Latin calx ("lime", "limestone") because it occurs in limestone. (Wiktionary)
  2. Latin calx, calc-, lime; see calx + -ium. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘calcium’ has been looked up 1588 times, added to 11 lists, commented on 1 time, and has a Scrabble score of 13.