/ Dictionary / Index B Big Belt Mountains: Meaning and Definition of Find definitions for: Big' Belt" Moun'tains Pronunciation: [key] a range of the Rocky Mountains, in W Montana. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. big beat Big Ben Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language