Definition of "Missouri" :

noun: a dialect of the Chiwere language spoken by the Missouri

noun: 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: the longest river in the United States; arises in Montana and flows southeastward to become a tributary of the Mississippi at Saint Louis

"The Missouri and Mississippi Rivers together form the third longest river in the world."

noun: a member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri