1.
[syn: horseweed, Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis]
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]
WordNet (r) 3.0 (2006):
Erigeron canadensis
n 1: 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: horseweed, Canadian fleabane,
fleabane, Conyza canadensis, Erigeron canadensis]