Hy"dro*pi`per\, n. [NL., fr. Gr. "y`dwr water + L. piper a pepper.] (Bot.) A species (Polygonum Hydropiper) of knotweed with acrid foliage; water pepper; smartweed.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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