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hydroxyapatite

[hahy-drok-see-ap-uh-tahyt] /haɪˌdrɒk siˈæp əˌtaɪt/
noun
1.
a mineral, Ca 10 (PO 4) 6 OH 2 , that is the principal storage form of calcium and phosphorus in bone.
Origin
1910-1915
1910-15; hydroxy- + apatite
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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hydroxyapatite in Medicine

hydroxyapatite hy·drox·y·ap·a·tite (hī-drŏk'sē-āp'ə-tīt')
n.
The principal bone salt that provides the compressional strength of vertebrate bone.

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

phosphate mineral, calcium hydroxide phosphate [Ca5(PO4)3OH], that forms glassy, often green crystals and masses. It is seldom pure in nature but often occurs mixed with fluorapatite, in which fluorine substitutes for the hydroxyl (OH) group in the molecule. This mixture, called a solid-solution series, is a continuous chemical variation between the two pure substances. Collophane, the apatite in fossil bone and phosphate rock belongs to the series. For physical properties, see phosphate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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