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Definition of Hydropiper
1. n. A species (Polygonum Hydropiper) of knotweed with acrid foliage; water pepper; smartweed.
Definition of Hydropiper
1. Noun. A form of knotweed, the water pepper, ''Polygonum hydropiper'' ¹
¹ Source: wiktionary.com
Medical Definition of Hydropiper
1.