Calcium - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

cal·ci·um

Audio Help [kal-see-uh

m] Pronunciation Key

–noun Chemistry, Biology.

a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; atomic weight: 40.08; atomic number: 20; specific gravity: 1.55 at 20°C.

[Origin: 1800–10; calc- + -ium

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Calcium

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American Heritage Dictionary - Cite This Source - Share This

cal·ci·um Audio Help (kāl'sē-əm) Pronunciation Key
n. Symbol Ca
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.

[Latin calx, calc-, lime; see calx + -ium.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
calcium

coined 1808 by Sir Humphry Davy from L. calx (gen. calcis) "limestone."

WordNet - Cite This Source - Share This

calcium
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

Kernerman English Multilingual Dictionary - Cite This Source - Share This
calcium [ˈkӕlsiəm] noun

an element of which one compound (calcium carbonate) forms limestone, chalk etc

Arabic:	فِلِز الكِلْس
Chinese (Simplified):	钙
Chinese (Traditional):	鈣
Czech:	vápník
Danish:	calcium
Dutch:	calcium
Estonian:	kaltsium
Finnish:	kalsium
French:	calcium
German:	das Kalzium
Greek:	ασβέστιο
Hungarian:	kalcium
Icelandic:	kalsíum
Indonesian:	kalsium
Italian:	calcio

Japanese:	カルシューム
Korean:	칼슘
Latvian:	kalcijs
Lithuanian:	kalcis
Norwegian:	kalsium, kalk
Polish:	wapń
Portuguese (Brazil):	cálcio
Portuguese (Portugal):	cálcio
Romanian:	calciu
Russian:	кальций
Slovak:	vápnik
Slovenian:	kalcij
Spanish:	calcio
Swedish:	kalcium
Turkish:	kalsiyum

The American Heritage Science Dictionary - Cite This Source - Share This

calcium Audio Help (kāl'sē-əm) Pronunciation Key
Symbol Ca
A silvery-white, moderately hard metallic element of the alkaline-earth group that occurs in limestone and gypsum. It is a basic component of leaves, bones, teeth, and shells, and is essential for the normal growth and development of most animals and plants. Calcium is used to make plaster, cement, and alloys. 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 Periodic Table.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

calcium cal·ci·um (kāl'sē-əm)
n.
Symbol Ca
A soft metallic element that is a basic component of animals and plants and constitutes [approx] 3 percent of Earth's crust. It occurs naturally in limestone, gypsum, and fluorite. Atomic number 20; atomic weight 40.08; melting point 842°C; boiling point 1,484°C; specific gravity 1.55; valence 2.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Merriam-Webster's Medical Dictionary - Cite This Source - Share This
Main Entry: cal·ci·um
Pronunciation: 'kal-sE-&m
Function: noun
often attributive : a silver-white bivalent metallic element that isan alkaline earth metal, occurs only in combination, and is an essential constituent of most plants and animals —symbol Ca; —see

ELEMENT

table

U.S. Gazetteer - Cite This Source - Share This

Calcium, NY (CDP, FIPS 11671) Location: 44.03470 N, 75.84798 W
Population (1990): 2465 (894 housing units)
Area: 14.5 sq km (land), 0.0 sq km (water)
Zip code(s): 13616

U.S. Gazetteer, U.S. Census Bureau

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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.

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.

On-line Medical Dictionary - Cite This Source - Share This

calcium

calcium: in CancerWEB's On-line Medical Dictionary

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