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n.1.(Bot.) A name given to several species of plants of the genus Polygonum, having angular stems beset with minute reflexed prickles.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Also known as Devil's Tear-Thumb, this spiny vine grows six inches-a-day, suffocating native plants.