from The Century Dictionary.
- noun A plant, Polygonum Hydropiper, also called
from the GNU version of the Collaborative International Dictionary of English.
- noun Smartweed; water pepper.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The water-pepper plant, Polygonum hydropiper.
from Wiktionary, Creative Commons Attribution/Share-Alike License
From arse + smart, because the plant stings when it touches bare skin, and was often laid in beds to kill fleas.
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