Search Result for "horseweed": 
Wordnet 3.0

NOUN (2)

1. erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States;
[syn: horse balm, horseweed, 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: 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):

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, horseweed, 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: horseweed, Canadian fleabane, fleabane, Conyza canadensis, Erigeron canadensis]