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Glossary

Curtain wall
A non-load-bearing external wall applied to a framed structure, in architecture of the 20th century onwards. Also a connecting wall between the towers of a castle.
Curvilinear tracery
Bar tracery with uninterrupted flowing curves, typical of the 14th century; also called flowing tracery.
Cusps
Projecting points formed by curves within the arches or tracery of Gothic architecture. A Kentish cusp or split cusp has a v-shaped opening set within the apex. In sub-cusping the sides of the cusps have smaller cusps, usually on a recessed plane.
Cutwater
A curved- or angle-ended stage at the bottom of a bridge pier.
Cyclopean masonry
Large irregular polygonal stones, smooth and finely jointed.
Cyma recta and cyma reversa
Classical mouldings with double curves.
Dado
The finishing (often with panelling) of the lower part of a wall, usually in a classical interior; in origin a formalized continuous pedestal. Dado rail: the moulding along the top of the dado.
Dagger
In tracery, an elongated ogee-ended lozenge shape.
Dais
A raised platform at one end of a medieval hall, where the lord or head of the household dined; also found in college or school halls, etc.
Dalle-de-verre
(French, lit. glass slab): A stained-glass technique invented in the mid- 20th century, setting large, thick pieces of cast glass into a frame of reinforced concrete or epoxy resin.

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