stones or bricks used in the construction of an arch. Usually wedge shaped
the wedge-shaped stones that form the curve of an arch
(Learning Modules / Mathematics / Bridges) The trapezoidal stones that are often used to form a rounded arch. The central voussoir is known as the 'keystone' and begins the distribution of the vertical 'load' forces down and around the arch. The keystone is the last voussoir to be placed in position, and allows each half of the arch to support the other....
The wedge-shaped stones that form the curved portions of an arch or a vaulted ceiling. Also see: arch, archivolt, keystone, springer. W
Any of the pieces, in the shape of a truncated wedge, that make up an arch or vault.