/ Dictionary / Index W White River: Meaning and Definition of Find definitions for: White' Riv'er Pronunciation: [key] a river flowing SE from NW Arkansas into the Mississippi River. 690 mi. (1110 km) long. a river flowing NE from NW Nebraska to the Missouri River in S South Dakota. 325 mi. (525 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. white rat white-robed Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language