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]