Definition of water pepper
: an annual European smartweed (Polygonum hydropiper) of moist soils with extremely acrid peppery juice that is naturalized in North America
also
: a related American perennial (P. hydropiperoides) with mildly acrid juice
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“Water pepper.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20pepper. Accessed 21 May. 2022.
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Time Traveler for water pepper
The first known use of water pepper was circa 1538
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