Definition of knotweed in English:

knotweed

Syllabification: knot·weed
Pronunciation: /ˈnätˌwēd
 
/

noun

1A plant of the dock family that typically has sheaths where the leaves join the stems. It is often an invasive weed.
  • Polygonum and other genera, family Polygonaceae: several species, in particular Japanese knotweed
More example sentences
  • Barberry, knotweed, and ailanthus are just some of the horticultural immigrants that continue to out-compete many of our indigenous species.
  • Abundant goosefoot, some knotweed (both erect knotweed and other species), some wild rice, and seeds of various grasses and weeds were also recovered.
  • Dock-leaved knotweed appeared in 1998, and overwhelmingly dominated the submergent littoral zone in 1999.
1.1Knotgrass.

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