| 1. | any of several spandrels, in the form of spherical triangles, forming a transition between the circular plan of a dome and the polygonal plan of the supporting masonry. |
| 2. | any of several masonry devices, as squinches or trompes, for forming a transition between a circular or polygonal construction, as a dome or lantern, and supporting masonry of a different plan. |
| 3. | functioning as, or substituting for, a pendentive: pendentive corbeling. |