1. 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 Noun
2. The longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis Noun
3. A member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri Noun
4. A dialect of the Chiwere language spoken by the Missouri Noun