a coarse weed of the genus Galeopsis, of the mint family, resembling hemp in appearance and having bristly hairs like the nettle.
Origin of hemp nettle
First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for hemp nettle
a hairy weedy plant, Galeopsis tetrahit, of northern regions, having helmet-shaped pink, purple, and white flowers and toothed leaves: family Lamiaceae (labiates)
any of various other plants of the genus Galeopsis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012