VOUSSOIR Meaning of VOUSSOIR in English [ 'vu:swα: ]■ noun Architecture a wedge-shaped or tapered stone used to construct an arch.OriginC18: via Fr. from pop. L. volsorium , based on L. volvere 'to roll'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004