Definify.com

Webster 1913 Edition

Noun.

(Chem.)

The act of becoming, or state of being, a hydrate.

Water of hydration

(Chem.)

water chemically combined with some substance to form a hydrate; – distinguished from

water of crystallization

hydration ‎(usually uncountable, plural hydrations)

(chemistry) the incorporation of water molecules into a complex with those of another compound
(biology) the process of providing an adequate amount of water to body tissues
(construction) the chemical reaction by which a substance (such as cement) combines with water, giving off heat to form a crystalline structure in its setting and hardening.