1. a member of the Siouan people who constituted a division of the Teton Sioux and who formerly inhabited the Black Hills of western South Dakota • Syn: Ogalala • Hypernyms: Teton, Lakota, Teton Sioux, Teton Dakota • Instance Hyponyms: Red Cloud 2. a Siouan language spoken by the Oglala • Syn: Ogalala • Hypernyms: Siouan, Siouan language