/ Dictionary / Index A Adirondack Mountains: Meaning and Definition of Find definitions for: Ad'iron'dack Moun'tains Pronunciation: [key] a mountain range in NE New York: a part of the Appalachian Mountains. Highest peak, Mt. Marcy, 5344 ft. (1629 m). Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Adirondack chair adit Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language