Oregon Trail definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
former route extending from the Missouri River in Mo., northwest to the Columbia River in Oreg., much used by westward migrants (c. 1840-60): c. 2,000 mi (3,219 km)
Oregon Trail definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A historical overland route to the western United States extending from various cities on the Missouri River to the Oregon Country and later Oregon Territory. The trail was opened in 1842, and by 1845 more than 3,000 migrants had made the arduous journey. After the coming of the railroad, the trail fell into disuse and was finally abandoned in the 1870s.