#1 Missouri n. [Show Me State, MO] 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. wn
#2 Missouri n. [Missouri River] 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". wn
#3 Missouri n. a member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri. wn
#4 Missouri n. a dialect of the Chiwere language spoken by the Missouri. wn
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