Source : Webster's Revised Unabridged Dictionary (1913)

Hydrate \Hy"drate\, v. t. [imp. & p. p. {Hydrated}; p. pr. & vb.
   n. {Hydrating}.]
   To form into a hydrate; to combine with water.

Hydrated \Hy"dra*ted\, a.
   Formed into a hydrate; combined with water.

Source : WordNet®

hydrated
     adj : containing combined water (especially water of
           crystallization as in a hydrate) [syn: {hydrous}] [ant:
            {anhydrous}]