psy·cho·ther·a·pist
-ˈther-ə-pəst
: an individual (as a psychiatrist, clinical psychologist, or psychiatric social worker) who is a practitioner of psychotherapy
psy·cho·ther·a·py
ˌsī-kō-ˈther-ə-pē
plural psychotherapies
1
: treatment of mental or emotional disorder or maladjustment by psychological means especially involving verbal communication (as in psychoanalysis, nondirective psychotherapy, reeducation, or hypnosis)
2
: any alteration in an individual's interpersonal environment, relationships, or life situation brought about especially by a qualified therapist and intended to have the effect of alleviating symptoms of mental or emotional disturbance
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Merriam-Webster unabridged



