Breadcrumb Home > Dictionary > Index B Blue Mountains: Meaning and Definition of Find definitions for: Blue' Moun'tains Pronunciation: [key] a range of low mountains in NE Oregon and SE Washington. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. blue moon blue mud ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language