'Hydration' definitions:
Definition of 'hydration'
From: WordNet
noun
The process of combining with water; usually reversible
Definition of 'Hydration'
From: GCIDE
- Hydration \Hy*dra"tion\, n. (Chem.) The act of becoming, or state of being, a hydrate. [1913 Webster]
- Water of hydration (Chem.), water chemically combined with some substance to form a hydrate; -- distinguished from water of crystallization. [1913 Webster]