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Definition of Knotweed
1. n. See Knotgrass.
Definition of Knotweed
1. Noun. Any of several plants of the genus ''Polygonum'', with jointed stems and inconspicuous flowers ¹
¹ Source: wiktionary.com
Definition of Knotweed
1. a common weed [n -S]
Medical Definition of Knotweed
1.