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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Polygonum \Po*lyg"o*num\, noun [NL., fr. Gr. ? a kind of plant; poly's many + go'ny 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.
From WordNet (r) 2.0 [wn]:
Polygonum
noun: diverse genus of herbs or woody subshrubs of north temperate regions [syn: {genus Polygonum}]
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