Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of knotweed is as below...

Polygonum :: Polygonum (n.) A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc..

Knotgrass :: Knotgrass (n.) a common weed with jointed stems (Polygonum aviculare); knotweed.

Snakeweed :: Snakeweed (n.) A kind of knotweed (Polygonum Bistorta).

Hydropiper :: Hydropiper (n.) A species (Polygonum Hydropiper) of knotweed with acrid foliage; water pepper; smartweed.

Knotweed :: Knotweed (n.) See Knot/rass.

Polygonaceous :: Polygonaceous (a.) Of or pertaining to a natural order of apetalous plants (Polygonaceae), of which the knotweeds (species of Polygonum) are the type, and which includes also the docks (Rumex), the buckwheat, rhubarb, sea grape (Coccoloba), and several other genera..

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