Calcium Definition

kălsē-əm

noun

A soft, silver-white, metallic chemical element, one of the alkaline-earth metals, found in limestone, marble, chalk, etc., always in combination: it is used as a reducing agent and in fertilizer, and is the essential part of bones, shells, and teeth: symbol, Ca; at. no. 20

Webster's New World

The definition of calcium is the fifth most abundant element in the human body.

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Calcium is is the fifth most abundant metal in the Earth’s crust, found in the form of a compound or a salt.

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Calcium carbonate is the salt that makes hard water.

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Calcium serves many functions in the body including the construction of bones and teeth.

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Synonyms:

Synonyms:
ca
atomic number 20

Other Word Forms of Calcium

Noun

Singular:

calcium

Plural:

calciums

Origin of Calcium

A New Latin word derived by Sir Humphry Davy in 1808, from Latin calx ("lime", "limestone") because it occurs in limestone.

From Wiktionary
Latin calx calc- lime calx –ium

From American Heritage Dictionary of the English Language, 5th Edition