Hydropiper \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. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Hydropiper \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.

Source: Webster's Revised Unabridged Dictionary (1913)