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 ;

2. (

• Siouan ,
• Siouan_language

) a family of North American Indian languages spoken by the Sioux ;

1. (

• Siouan

) of or relating to the Sioux people or their language and culture ;