| Noun | 1. | 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 Synonyms: Sioux |
| 2. | Siouan - a family of North American Indian languages spoken by the Sioux Synonyms: Siouan language | |
| Adj. | 1. | Siouan - of or relating to the Sioux people or their language and culture |
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