Breadcrumb Home > 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: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language