n. [ Gr. "y`dwr water: cf. F. hydrate.] (Chem.) (a) A compound formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. (b) A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl) so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide; as, ethyl hydrate, or common alcohol; calcium hydrate, or slaked lime. [1913 Webster]
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 ]
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