[po.lyg.o.num] n [NL, fr. Gk polygonon knotgrass, fr. poly- + gony knee--more at knee] (ca. 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
POLYGONUM
Meaning of POLYGONUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012