nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- A dioecious perennial Eurasian herb (Urtica dioica) having stinging hairs, inconspicuous greenish flowers, and coarsely toothed leaves.
- A perennial herb (Cnidoscolus stimulosus) of the southeast United States, having stinging hairs and fragrant white flowers.