WordNet (r) 3.0 (2006):

blue cohosh
    n 1: tall herb of eastern North America and Asia having blue
         berrylike fruit and a thick knotty rootstock formerly used
         medicinally [syn: blue cohosh, blueberry root,
         papooseroot, papoose root, squawroot, squaw root,
         Caulophyllum thalictrioides, Caulophyllum
         thalictroides]