(n) annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally, Syn.Ambrosia artemisiifolia
(n) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma, Syn.bitterweed, ambrosia
(n) coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico, Syn.Ambrosia psilostachya, perennial ragweed
(n) tall annual marsh elder common in moist rich soil in central North America that can cause contact dermatitis; produces much pollen that is a major cause of hay fever, Syn.Iva xanthifolia, false ragweed
(n) widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity, Syn.Senecio jacobaea, benweed, ragweed, tansy ragwort
The Collaborative International Dictionary of English (GCIDE) v.0.53
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