Source : Webster's Revised Unabridged Dictionary (1913)

Hydrotherapy \Hy`dro*ther"a*py\, n. [Hydro-, 1 + therapy.]
   (Med.)
   See {Hydropathy}.

Source : WordNet®

hydrotherapy
     n : the internal and external use of water in the treatment of
         disease [syn: {hydropathy}]