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Coping
The capping or covering of a wall.
Corbel
A structural piece of stone, wood or metal jutting from a wall to carry

a superincumbent weight.
Cornice

Upper section of an entablature, a projecting shelf along the top of a
wall often supported by brackets or corbels.
Cross Springer

Block from which the diagonal ribs of a vault spring or start. The top
of the springer is known as the skewback.

Crypto-porticus
Concealed or covered passage, generally underground, though lighted
and ventilated from the open air. One of the best-known examples is the
crypto-porticus under the palaces of the Caesars in Rome. In Hadrians villa

in Rome they formed the principal private intercommunication between
the several buildings.
Cupola

A small, most often dome-like, structure on top of a building.

D

Diastyle
Term used to designate an intercolumniation of three or four diame-
ters.

Diaulos
Peristyle round the great court of the palaestra, described by Vitruvius,
which measured two stadia (1,200 ft.) in length, on the south side this

peristyle had two rows of columns, so that in stormy weather the rain
might not be driven into the inner part. The word was also used in ancient
Greece for a foot race of twice the usual length.

Diazoma
A horizontal aisle in an ancient Greek theater that separates the lower
and upper tiers of semi-circular seating and intersects with the vertical

aisles.

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