/ Dictionary / Index O Orkhon: Meaning and Definition of Find definitions for: Or•khon Pronunciation: (ôr'kon), [key] — n. a river in E central Asia, flowing E, N, and then NE from the N central Mongolian People's Republic to the Selenga River. ab. 400 mi. (645 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Orjonikidze Orkney Islands Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language