water pepper

noun

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

First Known Use of water pepper

circa 1538, in the meaning defined above

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The first known use of water pepper was circa 1538

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