/ Dictionary / Index I Isar: Meaning and Definition of Find definitions for: I•sar Pronunciation: (ē'zär), [key] — n. a river in central Europe, flowing NE from W Austria through S Germany to the Danube River. 215 mi. (345 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isanthous isarithm Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language