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Noun: ragweed  'rag,weed
  1. Widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
    - ragwort, tansy ragwort, benweed, Senecio jacobaea
  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
    - ambrosia, bitterweed

Derived forms: ragweeds

Type of: weed

Part of: genus Ambrosia, genus Senecio, Senecio

Encyclopedia: Ragweed