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.