from The Century Dictionary.

  • noun A large genus of plants, type of the order Polygonaceæ and tribe Eupolygoneæ.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Bot.) A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic genus within the family Polygonaceae — including the various knotweeds, smartweeds, and bistort.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun diverse genus of herbs or woody subshrubs of north temperate regions


from Wiktionary, Creative Commons Attribution/Share-Alike License

The name is probably derived from the Ancient Greek πολύς (polus, "many") and γόνυ (gony, "knee")


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