Webster's Revised Unabridged Dictionary · 1913

Therapeutic

Therapeutic , adjective

[French thérapeutique, Greek {not transcribed}, from {not transcribed} attendant, servant, {not transcribed} to serve, take care of, treat medically, {not transcribed} attendant, servant.]

(Medicine) 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

Also: Therapeutical

Therapeutic , noun

One of the Therapeutae.