Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various marsh plants of the genus Polygonum, having sheathlike stipules and small, densely clustered pink, white, or green flowers.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of more than a dozen species of the genus Polygonum.

from the GNU version of the Collaborative International Dictionary of English

  • n. An acrid plant of the genus Polygonum (P. Hydropiper), which produces smarting if applied where the skin is tender.

from The Century Dictionary and Cyclopedia

  • n. The water-pepper, Polygonum Hydropiper, a weed of wet places in the Old World and the New.

Etymologies

smart +‎ weed (Wiktionary)

Examples

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