Definitions for knotweedˈnɒtˌwid
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Random House Webster's College Dictionary
knot•weedˈnɒtˌwid(n.)
any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.
Category: Plants
Origin of knotweed:
1570–80
Wiktionary
knotweed(Noun)
Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers
Webster Dictionary
Knotweed(noun)
see Knot/rass
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"knotweed." Definitions.net. STANDS4 LLC, 2013. Web. 26 May 2013. <http://www.definitions.net/definition/knotweed>.