Definition of fan vault in English:

fan vault

Syllabification: fan vault

Entry from US English dictionary

noun

Architecture
A type of vault consisting of a set of concave ribs spreading out from a central point like the ribs of an opened umbrella, used especially in the English Perpendicular style.

Derivatives

fan vaulting

noun

Definition of fan vault in:

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...