1911 Encyclopædia Britannica/Voussoir

VOUSSOIR (Ger. Wölbestein), the French term used by architects for the wedge-shaped stones or other material with which the arch (q.v.) is constructed; the lowest stone on each side is termed the springer (Fr. coussinet sommier) and the upper one at the crown of the arch the keystone (Fr. claveau).

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