Horse·weed n. Bot. A composite plant (Erigeron Canadensis), which is a common weed.
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Erigeron canadensis
n : 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]