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Siouan (adj.)

1885, from Sioux + -an. Replacing Dakotan.

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Definitions of Siouan from WordNet
1
Siouan (n.)
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;
Synonyms: Sioux
Siouan (n.)
a family of North American Indian languages spoken by the Sioux;
Synonyms: Siouan language
2
Siouan (adj.)
of or relating to the Sioux people or their language and culture;
From wordnet.princeton.edu