voussoir

One of the wedge-shaped stones forming the curved parts of an arch or vaulted ceiling.

To form with voussoirs; construct by means of voussoirs.

In architecture, a stone in the shape of a truncated wedge, which forms part of an arch.

One of the wedgelike stones of which an arch is composed.

One of a series of wedge–shaped bricks forming an arch or vault.

wedge-shaped stone building block used in constructing an arch or vault