See under cohosh.
Origin of blue cohosh
An Americanism dating back to 1815–25
either of two unrelated plants of the eastern U.S., Cimicifuga racemosa (black cohosh), of the buttercup family, or Caulophyllum thalictroides (blue cohosh), of the barberry family, both used medicinally.
Origin of cohosh
1790–1800, Americanism; < Eastern Abenaki kkwὰhas
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
any of several North American plants, such as the blue cohosh (Caulophyllum thalictroides: family Leonticaceae) and black cohosh (Cimicifuga racemosa: family Ranunculaceae)
Word Origin for cohosh
C18: probably of Algonquian origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012