Source : Webster's Revised Unabridged Dictionary (1913)

Therapeutic \Ther`a*peu"tic\, Therapeutical \Ther`a*peu"tic*al\,
   a. [F. th['e]rapeutique, Gr. ?, from ? attendant, servant, ?
   to serve, take care of, treat medically, ? attendant,
   servant.] (Med.)
   Of or pertaining to the healing art; concerned in discovering
   and applying remedies for diseases; curative. ``Therapeutic
   or curative physic.'' --Sir T. Browne.

         Medicine is justly distributed into ``prophylactic,''
         or the art of preserving health, and therapeutic, or
         the art of restoring it.                 --I. Watts.

Source : WordNet®

therapeutical
     adj : relating to or involved in therapy; "therapeutic approach to
           criminality" [syn: {therapeutic}]