/kawr"beuhl/, n., v., corbeled, corbeling or (esp. Brit.) corbelled, corbelling. Archit.
1. any bracket, esp. one of brick or stone, usually of slight extent.
2. a short horizontal timber supporting a girder.
3. to set (bricks, stones, etc.) so as to form a corbel or corbels (usually fol. by out).
4. to support by means of a corbel or corbels.
[1375-1425; late ME < MF < ML corvellus, equiv. to L corv(us) RAVEN1 + -ellus dim. suffix]

* * *

Block or brick partially embedded in a wall, with one end projecting out from the face.

The weight of added masonry above counterbalances the cantilever and keeps the block from falling out of the wall. Corbeling often occurs over several courses, with each block or brick overhanging the one below so as to resemble a set of inverted steps. The form may be continuous, as in a corbeled arch, or a series of separate brackets, as on a medieval battlement. Corbeling was used extensively before the development of true arches and vaults.

* * *

      in architecture, bracket or weight-carrying member, built deeply into the wall so that the pressure on its embedded portion counteracts any tendency to overturn or fall outward. The name derives from a French word meaning crow, because of the corbel's beaklike shape. Corbels may be individual pieces of stone, separate from each other like brackets (bracket), as in the case of many elaborately carved medieval and Renaissance cornices, or they may be continuous courses of masonry, such as the corbels under projecting oriel windows.

 A corbel arch consists of two opposing sets of overlapping corbels, resembling inverted staircases, which meet at a peak and create a structure strong enough to support weight from above. Babylonian architecture made wide use of corbel arches. When such arches are used in a series, they become a corbel vault, which, as in the Mayan style, can support a roof or upper story. Corbel vaults and arches were useful in cultures that had not yet developed curving arches and other ceiling structures. Structural corbeling has fallen out of general use in contemporary architecture.

* * *

Universalium. 2010.