polygonum

World English Dictionary
polygonum (pəˈlɪɡənəm)
 
n
knotgrass bistort See also prince's feather any polygonaceous plant of the genus Polygonum, having stems with knotlike joints and spikes of small white, green, or pink flowers
 
[C18: New Latin, from Greek polugonon knotgrass, from polu-poly- + -gonon, from gonu knee]

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