WordNet (r) 3.0 (2006):
Siouan adj 1: of or relating to the Sioux people or their language and culture n 1: a member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains [syn: Sioux, Siouan] 2: a family of North American Indian languages spoken by the Sioux [syn: Siouan, Siouan language]