noun Date: 1884 any of several herbs (genus Polygonum ) of the buckwheat family with leaves and bracts jointed and having a very short petiole
KNOTWEED
Meaning of KNOTWEED in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012