/ Dictionary / Index H horseweed: Meaning and Definition of Find definitions for: horse•weed Pronunciation: (hôrs'wēd"), [key] — n. a North American composite weed, Erigeron canadensis, having narrow, hairy leaves and clusters of very small greenish-white flowers. See any of various other common weeds with small yellow flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: horseweed (Thesaurus) horse trading horsewhip Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language