Definition of blue cohosh
: a perennial North American herb (Caulophyllum thalictroides) of the barberry family that has greenish-yellow or purplish flowers and large blue berrylike fruits
First Known Use of blue cohosh
Medical Definition of blue cohosh
: a tall herb (Caulophyllum thalictroides of the family Berberidaceae) of eastern North America and Asia having large blue berrylike fruits and a thick knotty rootstock that was formerly used as an antispasmodic and emmenagogue
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