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knotweed

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WordReference Random House Unabridged Dictionary of American English © 2026

knot•weed n.

Plant Biologyany of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.

knot¹ + weed¹ 1570–80

'knotweed' also found in these entries (note: many are not synonyms or translations):

buckwheat family - Japanese knotweed - knawel - seaside knotweed

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