Origin: Fr < OFr volsoir, curvature of a vault < VL *volsorium < *volsus, for L volutus, pp. of volvere, to roll: see walk
See voussoir in American Heritage Dictionary 4
Origin: , from Old French vossoir
Origin: , from Vulgar Latin *volsōrium
Origin: , from *volsus
Origin: , past participle of Latin volvere, to turn, roll; see wel-2 in Indo-European roots.
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