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Meaning of ragweed

rag•weed

Pronunciation: (rag'wēd"), [key]
— n.
  1. any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever, as the common North American species, A. trifidaand A. artemisiifolia.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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