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knotweed

American

[not-weed] / ˈnɒtˌwid /

noun

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

knotweed British

/ ˈnɒtˌwiːd /

noun

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

Etymology

Origin of knotweed

First recorded in 1570–80; knot ¹ + weed ¹

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Money squad discusses the Chase infinite money TikTok craze, the “founder mode” craze, and the menace of Japanese knotweed.

From Slate • Sep. 7, 2024

KINGSTON, Mass. — Asa Peters marched into a thicket of Japanese knotweed in the woods of coastal Massachusetts this month and began steadily hacking the towering, dense vegetation down to size.

From Washington Times • Aug. 24, 2022

Institute FC was forced to leave the Riverside Stadium in 2017 due to severe flooding and a subsequent infestation of Japanese knotweed.

From BBC • Aug. 13, 2022

Rhubarb is part of the buckwheat family, which also includes plants like Japanese knotweed and sorrel.

From Salon • Mar. 20, 2022

Its crops were such unfamiliar plants as marshelder, knotweed, maygrass, and little barley.

From "1491" by Charles C. Mann

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023