a family of North American Indian languages spoken by the Sioux | a dialect of the Chiwere language spoken by the Missouri |
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 | a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union |
| the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis |
| a member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri |