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polygonum

noun
  1. any polygonaceous plant of the genus Polygonum, having stems with knotlike joints and spikes of small white, green, or pink flowersSee also knotgrass, bistort, prince's feather (def. 2)
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Word Origin

C18: New Latin, from Greek polugonon knotgrass, from polu- poly- + -gonon, from gonu knee
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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