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Definition of Missouri river
1. 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"
Exact synonyms: Missouri
Group relationships: America, The States, U.s., U.s.a., United States, United States Of America, Us, Usa
Generic synonyms: River
Group relationships: America, The States, U.s., U.s.a., United States, United States Of America, Us, Usa
Generic synonyms: River