/ Dictionary / Index D double altar: Meaning and Definition of Find definitions for: dou'ble al'tar Pronunciation: [key] an altar on which the Eucharist may be celebrated from either the liturgical east or the liturgical west side. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double agent double ax Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language