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.
noun 1. a system of fan vaults. noun 1. (architect) vaulting having ribs that radiate like those of a fan and spring from the top of a capital or corbel Also called palm vaulting
[fan-weed] /ˈfænˌwid/ noun 1. the pennycress, Thlaspi arvense.
noun, Architecture. 1. a window having a fanlike form with radiating sash bars, used especially as a fanlight.
[fan-wahyz] /ˈfænˌwaɪz/ adverb 1. spread out like an open : to hold cards fanwise.