Source : Webster's Revised Unabridged Dictionary (1913)

Cohosh \Co"hosh\, n. (Bot.)
   A perennial American herb ({Caulophyllum thalictroides}),
   whose rootstock is used in medicine; -- also called {pappoose
   root}. The name is sometimes also given to the {Cimicifuga
   racemosa}, and to two species of {Act[ae]a}, plants of the
   Crowfoot family.

Source : WordNet®

cohosh
     n : a plant of the genus Actaea having acrid poisonous berries
         [syn: {baneberry}, {herb Christopher}]