Source : Webster's Revised Unabridged Dictionary (1913)

Hydropathic \Hy`dro*path"ic\, Hydropathical \Hy`dro*path"ic*al\,
   a.
   Of or pertaining to hydropathy.

Source : WordNet®

hydropathic
     adj : of or relating to hydropathy or its administration;
           "hydropathic treatments"