ragweed (redirected from ragweeds)

rag·weed  (rgwd)

n.

1. Any of various weeds of the genus Ambrosia having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.

2. Chiefly British Ragwort.

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[From the ragged shape of its leaves.]

Thesaurus

Noun	1.	ragweed - widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity benweed, ragwort, Senecio jacobaea, tansy ragwort genus Senecio, Senecio - enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds weed - any plant that crowds out cultivated plants
	2.	ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma ambrosia, bitterweed genus Ambrosia - comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae Ambrosia artemisiifolia, common ragweed - annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally Ambrosia trifida, great ragweed - a coarse annual with some leaves deeply and palmately three-cleft or five-cleft Ambrosia psilostachya, perennial ragweed, western ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico weed - any plant that crowds out cultivated plants