2 definitions
for horseweed
From The Collaborative International Dictionary of English v.0.48 :
Horseweed \Horse"weed`\, n. (Bot.)
A composite plant ({Erigeron Canadensis), which is a common
weed.
[1913 Webster]
From WordNet (r) 2.0 :
horseweed
n 1: erect perennial strong-scented with serrate pointed leaves
and a loose panicle of yellowish flowers; the eastern
United States [syn: horse balm, stoneroot, stone-root,
richweed, stone root, Collinsonia canadensis]
2: common North American weed with linear leaves and small
discoid heads of yellowish flowers; widely naturalized
throughout temperate regions; sometimes placed in genus
Erigeron [syn: Canadian fleabane, fleabane, Conyza
canadensis, Erigeron canadensis]