World English Dictionary
polygonum (pəˈlɪɡənəm)
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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