Dictionary.com
definitions

pepperwort

[pep-er-wurt, -wawrt]
noun
  1. water clover.

Origin of pepperwort

First recorded in 1555–65; pepper + wort2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for pepperwort

pepperwort

noun
  1. any of various temperate and tropical aquatic or marsh ferns of the genus Marsilea, having floating leaves consisting of four leaflets: family Marsileaceae
  2. any of several plants of the genus Lepidium, esp L. campestre, of dry regions of Eurasia, having small white flowers and pungent seeds: family Brassicaceae (crucifers)Usual US and Canadian name: peppergrass
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