Pronunciation: (hôrs'wēd"), [key]
1. a North American composite weed, Erigeron canadensis, having narrow, hairy leaves and clusters of very small greenish-white flowers.
2. See horse balm.
3. any of various other common weeds with small yellow flowers.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.