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" 米国で最も長い川。モンタナ州に発して南東に流れ、セントルイスでミシシッピ川に注ぐ。
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【上位】 a large natural stream of water (larger than a creek); "the river was navigable for 50 miles" 広い自然の水流（クリークより広い）。
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