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Definition of knotweed

knotweed

/ˈnɑːt.wiːd/
knot · weed
Plural:knotweeds
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knotweed Lexical Profile

knotweed Game Scores & Validity

• noun

1

Any of various wild plants of the buckwheat family (Polygonaceae), characterized by swollen, heavily jointed stems and small flowers, with several species widely notorious as aggressive and highly destructive invasive weeds.

Example

"Homeowners often face a costly battle to eradicate Japanese knotweed once its deep root system establishes itself in their gardens."

Synonyms
View all synonyms for knotweed

• Rhymes for knotweed

• Nearby Words

knottily
knotting
knotty
knotweed
know
know-how
knowable

Word Origin & Etymology

Coined in English by combining 'knot' and 'weed', in reference to the prominent, swollen joints (knots) that characterize the stems of these plants.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Knotweed. In Wordmom Dictionary. Retrieved Nov 4, 2026, from https://wordmom.com/dictionary/knotweed
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