/ Dictionary / Index F fan vaulting: Meaning and Definition of Find definitions for: fan' vault"ing Pronunciation: [key] a system of fan vaults. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fan vault fanweed 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