A person, usually a psychiatrist or clinical psychologist, professionally trained and engaged in psychotherapy. Currently, the term is also applied to social workers, nurses, and others whose state-licensed practice acts include psychotherapy.
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psy·cho·ther·a·pist -'ther-ə-pəst n an individual (as a psychiatrist, clinical psychologist, or psychiatric social worker) who is a practitioner of psychotherapy
Medical dictionary. 2011.