The Irtysh river.Licensed from iStockPhoto
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
river in central Asia, flowing from NW China northwestward into the Ob: c. 1,850 mi (2,977 km)
also sp. Irtish
Used by arrangement with John Wiley & Sons, Inc.
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 river of northwest China, eastern Kazakhstan, and central Russia flowing about 4,264 km (2,650 mi) generally northwest to the Ob River. It is navigable for much of its course.