‖Hy″dro‐pi′per (?), n. [NL., fr. Gr. ὕδωρ water + L. piper a pepper.] (Bot.) A species (Polygonum Hydropiper) of knotweed with acrid foliage; water pepper; smartweed.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.