Wiktionary
blue cohosh
n. A perennial American herb ((taxlink Caulophyllum thalictroides species noshow=1)), the root of which is used in medicine.
WordNet
blue cohosh
n. tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally [syn: blueberry root, papooseroot, papoose root, squawroot, squaw root, Caulophyllum thalictrioides, Caulophyllum thalictroides]