1a major river of North America, one of the main tributaries of the Mississippi. It rises in the Rocky Mountains in Montana and flows 3,736 km (2,315 miles) to meet the Mississippi just north of St Louis.
2a state of the US, bounded on the east by the Mississippi River; population 5,911,605 (est. 2008); capital, Jefferson City. It was acquired as part of the Louisiana Purchase in 1803, becoming the 24th state of the US in 1821.
noun & adjective
Missouri in other Oxford dictionaries
Definition of Missouri in the US English dictionary