Archit. any of the wedge-shaped stones, or other parts, of which an arch is built: the central, topmost voussoir is called the keystone; either of the lowest voussoirs is called the springer
Origin of voussoirFrench from Old French volsoir, curvature of a vault from Vulgar Latin an unverified form volsorium from an unverified form volsus, for Classical Latin volutus, past participle of volvere, to roll: see walk
One of the wedge-shaped stones forming the curved parts of an arch or vaulted ceiling.
Origin of voussoirFrench from Old French vossoir from Vulgar Latin volsōrium from volsus past participle of Latin volvere to turn, roll ; see wel-2 in Indo-European roots.