/ Dictionary / Index I Irtysh: Meaning and Definition of Find definitions for: Ir•tysh Pronunciation: (ir-tish'), [key] — n. a river in central Asia, flowing NW from the Altai Mountains in China through NE Kazakhstan and the Russian Federation to the Ob River. ab. 1840 mi. (2960 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: irtysh (Thesaurus) IRS Irvine Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language