Main Entry:

vous·soir

Pronunciation:

\vü-ˈswär, ˈvü-ˌ\

Function:

noun

Etymology:

French, from Old French vosoir, from Vulgar Latin *volsorium, from Latin volvere to roll — more at voluble

Date:

1728

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