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blue cohosh, blueberry root, papooseroot, papoose root, squawroot, squaw root, Caulophyllum thalictrioides, Caulophyllum thalictroides | tall herb of eastern North America and Asia having blue berrylike fruit and a thick knotty rootstock formerly used medicinally ❲Caulophyllum thalictroides, Caulophyllum thalictrioides❳ |