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Noun: Missouri River
  1. 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 River and Mississippi Rivers together form the third longest river in the world";
    - Missouri

Type of: river

Part of: America, the States, U.S., U.S.A., United States, United States of America, US, USA

Encyclopedia: Missouri River