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knotweed

[not-weed] /ˈnɒtˌwid/
noun
1.
any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.
Origin
1570-1580
1570-80; knot1 + weed1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for knot weed

knotweed

/ˈnɒtˌwiːd/
noun
1.
any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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