(n)a river that rises in northeastern Wyoming and flows through Montana and South Dakota to join the Missouri River in North Dakota, Syn.Little Missouri River
(n)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, Syn.MO, Show Me State
(n)the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis, Syn.Missouri River