Definition of muskrat weed in US English:

muskrat weed

noun

  • 1Any of several poisonous North American plants of the family Apiaceae (Umbelliferae), especially a water hemlock, Cicuta maculata.

  • 2A tall North American meadow rue, Thalictrum polygamum.

Origin

Mid 19th century; earliest use found in Constantine Rafinesque (1783–1840).