/ Dictionary / Index Y Yellowstone: Meaning and Definition of Find definitions for: Yel•low•stone Pronunciation: (yel'ō-stōn"), [key] — n. a river flowing from NW Wyoming through Yellowstone Lake and NE through Montana into the Missouri River in W North Dakota. 671 mi. (1080 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: yellowstone (Thesaurus) yellow spot Yellowstone Falls Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language