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.

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.

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The noun has one meaning:

Meaning #1: the water present in hydrated compounds
  Synonyms: water of crystallization, water of crystallisation

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