ragweed : Idioms & Phrases

• noun annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
  Ambrosia artemisiifolia.
  

WordNet

• noun 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
  burweed marsh elder; Iva xanthifolia.
  

WordNet

• noun a coarse annual with some leaves deeply and palmately three-cleft or five-cleft
  Ambrosia trifida.
  

WordNet

• a coarse American herb (Ambrosia trifida), with rough three-lobed opposite leaves.

Webster 1913

• noun coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
  Ambrosia psilostachya; perennial ragweed.
  

WordNet

• noun pollen of the ragweed plant is a common allergen
  

WordNet

• noun coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
  Ambrosia psilostachya; perennial ragweed.
  

WordNet