Dras″tic (?), a. [Gr. �, fr. � to do, act: cf. F. drastique. See Drama.] (Med.) Acting rapidly and violently; efficacious; powerful; — opposed to bland; as, drastic purgatives. — n.(Med.) A violent purgative. See Cathartic.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.