n.
Pronunciation: p ə - ' li-g ə -n ə m
Function: noun
Etymology: New Latin, from Greek polygonon knotgrass, from poly- + gony knee ― more at KNEE
Date: circa 1706
: any of a genus ( Polygonum ) of herbs of the buckwheat family with a prominent tubular sheath around the base of each petiole, thickened nodes, and flowers that are solitary and axillary or in spiked racemes ― called also knotweed