Akademik

1. widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States

2. any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma

↑common ragweed, ↑Ambrosia artemisiifolia, ↑great ragweed, ↑Ambrosia trifida, ↑western ragweed, ↑perennial ragweed, ↑Ambrosia psilostachya

1. : any of several American plants containing a bitter principle: as

a. : ragweed 2

b. : horseweed

c. : sneezeweed 1a

d. : any of several trees of the genus Xylopia; especially : a West Indian tree (X. glabra) : bitter rubberweed

2. : the wood of a bitterweed tree

/bit"euhr weed'/, n.

1. any of various plants containing a bitter principle, as those of the genus Picris.

2. a sneezeweed, Helenium amarum.

[1810-20, Amer.; BITTER + WEED¹]