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water of hydration

noun, Chemistry
1.
the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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water hydration in Medicine

water of hydration n.
Water chemically combined with a substance in such a way that it can be removed, as by heating, without substantially changing the chemical composition of the substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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water hydration in Science
water of hydration  
Water that is chemically combined with other molecules to form a hydrate mineral and that is easily removed through heating.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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