a vault composed of a number of concave conoidal surfaces, usually four, springing from the corners of the vaulting compartment and touching or intersecting at the top, often decorated with ribs. See illus. under vault 1 .
FAN VAULT
Meaning of FAN VAULT in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012