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.
[1913 Webster] Cohune