/ Dictionary / Index B Badlands National Park: Meaning and Definition of Find definitions for: Bad'lands Na'tional Park' Pronunciation: [key] a national park in SW South Dakota: rock formations and animal fossils. 380 sq. mi. (985 sq. km). Formerly (1929–77), Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. badlands badly Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language