/ Dictionary / Index Y Yellowstone National Park: Meaning and Definition of Find definitions for: Yel'lowstone Na'tional Park' Pronunciation: [key] a park in NW Wyoming and adjacent parts of Montana and Idaho: geysers, hot springs, falls, canyon. 3458 sq. mi. (8955 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yellowstone Lake yellow streak Related Content Daily Word Quiz: draconian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language