‖Po‐lyg″o‐num (?), n. [NL., fr. Gr. � a kind of plant; πολύσ many + γόνυ the knee, a joint of a plant. So called in allusion to the numerous joints.] (Bot.) A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.