- an American Indian language family formerly widespread from Saskatchewan to the lower Mississippi, also found in the Virginia and Carolina piedmont, and including Catawba, Crow, Dakota, Hidatsa, Mandan, Osage, and Winnebago.
- a member of one of the Siouan-speaking peoples.
- of or relating to the Sioux or the Siouan languages.
- a family of North American Indian languages including Sioux, probably related to Iroquoian
- of or relating to the Sioux peoples or languages
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