(n.) An acrid plant of the genus Polygonum (P. Hydropiper), which produces smarting if applied where the skin is tender.
Example Sentences:
(1) The mechanism of antimutagenicity of water extracts of grass-wrack pondweed (Potamogeton oxyphylus Miquel), curled pondweed (Potamogeton crispus L.) and smartweed (Polygonum hydropiper L.) towards benzo[a]pyrene mutagenicity in Salmonella typhimurium was investigated.