/ Dictionary / Index R ribbed vault: Meaning and Definition of Find definitions for: ribbed' vault' Pronunciation: [key] — Archit. Archit. a vault supported by or decorated with diagonal ribs. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ribbed toad Ribbentrop Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language