Siouan Syllabification: (Siou·an)Pronunciation: /ˈso͞oən/Definition of Siouan noun a family of North American Indian languages spoken by the Sioux and related peoples, including Crow, Dakota, Hidatsa, Lakota, Mandan, Omaha, and Yankton. adjective relating to the Siouan language family. Siouan in other Oxford dictionaries Definition of Siouan in the British & World English dictionary
