Osage /ˈoʊseɪdʒ/ is a Siouan language spoken by the Osage people of Oklahoma. The last native speaker, Lucille Roubedeaux, died ca. 2005.Osage has an inventory of sounds very similar to that of Dakota, plus vowel length, preaspirated obstruents, and an interdental fricative (like "th" in English "then").