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water pepper

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noun
  1. a widely distributed annual plant, Polygonum hydropiper, of marshes and bogs, characterized by acrid, peppery-tasting leaves.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for water pepper

water pepper

noun
  1. any of several polygonaceous plants of the genus Polygonum, esp P. hydropiper, of marshy regions, having reddish stems, clusters of small greenish flowers, and acrid-tasting leaves
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