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Adj.1.Siouan-speaking - able to communicate in a Siouan language
communicatory, communicative - able or tending to communicate; "was a communicative person and quickly told all she knew"- W.M.Thackeray
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It was promised to the Siouan-speaking Kaw, the Quapaw, the Ponca, the Iowa, and the Otoe-Missouria.