Bis″tort (�), n. [L. bis + tortus, p. p. of torquere to twist: cf. F. bistorte.] (Bot.) An herbaceous plant of the genus Polygonum, section Bistorta; snakeweed; adderwort. Its root is used in medicine as an astringent.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.