Of or relating to the Sioux language family or any language within this group; = Siouan, adj.

Of, belonging to, or relating to the Dakota or their dialect. Also: of, belonging to, or relating to the Sioux language.

Of or relating to a family of languages spoken by the Sioux and related peoples such as Crow, Hidatsa, Mandan, and Omaha; = Sioux, adj. 2. Also…

Of, relating to, or designating the Dhegiha language spoken by the Omahas.