voussoir


vous·soir

noun \vü-ˈswär, ˈvü-ˌ\

Definition of VOUSSOIR

:  one of the wedge-shaped pieces forming an arch or vault — see arch illustration

Origin of VOUSSOIR

French, from Old French vosoir, from Vulgar Latin *volsorium, from Latin volvere to roll — more at voluble
First Known Use: 1728

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