bistort

noun
bis·tort | \ˈbis-ˌtȯrt, bis-ˈtȯrt\

Definition of bistort 

: any of several polygonums especially : a Eurasian perennial herb (Polygonum bistorta) with twisted roots used as astringents

First Known Use of bistort

1578, in the meaning defined above

History and Etymology for bistort

Middle French bistorte, from Medieval Latin *bistorta, from Latin bis + torta, feminine of tortus, past participle of torquēre to twist — more at torture entry 1

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The first known use of bistort was in 1578

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