/ Dictionary / Index B barrel vault: Meaning and Definition of Find definitions for: bar'rel vault" Pronunciation: [key] — Archit. Archit. a vault having the form of a very deep arch. Also calledSee illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. barrel roof barren Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language