Adjective siouan has 1 sense
  1. Siouan - of or relating to the Sioux people or their language and culture
,Noun siouan has 2 senses
  1. 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:
     Biloxi; Catawba; Crow; Dakota; Dhegiha; Hidatsa, Gros Ventre; Hunkpapa; Iowa, Ioway; Missouri; Ofo; Oglala, Ogalala; Oto, Otoe; Santee, Santee Sioux, Santee Dakota, Eastern Sioux; Tutelo; Winnebago; Crazy Horse, Tashunca-Uitco; Rain-in-the-Face
  2. 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
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