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Related to hydration: dehydration
A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal. Often used in combination: pentahydrate
v. hy·drat·ed, hy·drat·ing, hy·drates
1. To rehydrate.
2. To supply water to (a person, for example) in order to restore or maintain fluid balance: "Cold water is the fastest and safest way to hydrate an ordinary athlete" (Jane E. Brody).
To become a hydrate.