Architecture A triangular part of vaulting amongst the rim of a dome and every adjacent pair of the arches that support it.
The concave triangular sections of vaulting that offer the transition between a dome and also the square base on which it really is set and transfer the weight for the dome.
The percentage of a vault by means of that the square room in the center of a building is taken to an octagon or circle to get a cupola.
The part of a groined vault which can be supported by, and springs from, one pier or corbel.
In architecture, among the triangular segments associated with lower element of a hemispherical dome remaining because of the penetration regarding the dome by two semicircular or ogival vaults, intersecting at correct perspectives.