Definition of rattleweed in English:

rattleweed

noun

  • 1Chiefly US. Black cohosh, Cimicifuga (or Actaea) racemosa (family Ranunculaceae).

  • 2Any of various plants of the family Fabaceae (Leguminosae); specifically those of the genus Crotalaria or Astragalus, both of which are poisonous to livestock when eaten in quantity.

Origin

Late 18th century; earliest use found in Transactions of the American Philosophical Society. From either rattle or rattle + weed.

Pronunciation

rattleweed

/ˈratlwiːd/