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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.

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.

n. 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.

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.

n. A calcium light.

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

"In muscle cells a rise in calcium is the signal for muscular work."

metallic element    metal   

calcium light    limestone    chalk    lime   

factor iv    calcium ion   

magnesium    zinc    chloride    hydrogen    vitamin    chlorine    lithium    cholesterol    barium    boron