/oh"sayj, oh sayj"/ , n. , pl. Osages , ( esp. collectively ) Osage for 1.
1. a member of a North American Indian people formerly of western Missouri, now living in northern Oklahoma.
2. the Siouan language of the Osage.
3. a river flowing E from E Kansas to the Missouri River in central Missouri. 500 mi. (800 km) long.