- Sioux, Siouan - 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
--1 is a kind of Plains Indian, Buffalo Indian
--1 has particulars: - Siouan, Siouan language - a family of North American Indian languages spoken by the Sioux
--2 is a kind of Amerind, Amerindian language, American-Indian language, American Indian, Indian
--2 has particulars:Biloxi; Catawba; Chiwere; Crow; Dakota; Dhegiha; Hidatsa, Gros Ventre; Hunkpapa; Ofo; Oglala, Ogalala; Santee; Tutelo; Winnebago