Source : Webster's Revised Unabridged Dictionary (1913)

Psychotherapy \Psy`cho*ther"a*py\, n. [Psycho- + therapy.]
   (Med.)
   Psychotherapeutics.

Source : WordNet®

psychotherapy
     n 1: the branch of psychiatry concerned with psychological
          methods [syn: {psychotherapeutics}, {mental hygiene}]
     2: the treatment of mental or emotional problems by
        psychological means