[mi-zoo
r-ee, -zoor-uh] 
) -sour⋅i for 3. | 1. | a state in the central United States. 4,917,444; 69,674 sq. mi. (180,455 sq. km). Capital: Jefferson City. Abbreviation: MO (for use with zip code), Mo. |
| 2. | a river flowing from SW Montana into the Mississippi N of St. Louis, Mo. 2723 mi. (4382 km) long. |
| 3. | a member of a North American Indian tribe belonging to the Siouan linguistic stock, located on the Missouri River in early historic times and now extinct as a tribe. |
| 4. | from Missouri, Informal. unwilling to accept something without proof; skeptical: I'm from Missouri—you'll have to show me that you're right. |
| Missouri River A river of the United States rising in the Rocky Mountains as various headstreams that join to form the Missouri proper in southwest Montana. The longest river in the United States, it flows about 4,127 km (2,565 mi) in a meandering course to the Mississippi River north of St. Louis, Missouri. French explorers first reached the river in the late 17th century, and Lewis and Clark followed it on their journey westward (1804-1806). |
State in the central United States bordered by Iowa to the north; Illinois, Kentucky, and Tennessee to the east; Arkansas to the south; and Oklahoma, Kansas, and Nebraska to the west. Its capital is Jefferson City, and its largest city is St. Louis.