voussoir

[voo-swahr]
noun Architecture.
any of the pieces, in the shape of a truncated wedge, that form an arch or vault.

Origin:
1325–75; < French; replacing Middle English vousor(i)e < Anglo-French; Old French volsoir < Vulgar Latin *volsōrium, equivalent to *volt(us) (for Latin volūtus), past participle of volvere to turn + -tōrium -tory2 with tt > s

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World English Dictionary
voussoir (vuːˈswɑː)
 
n
a wedge-shaped stone or brick that is used with others to construct an arch or vault
 
[C18: from French, from Vulgar Latin volsōrium (unattested), ultimately from Latin volvere to turn, roll]

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Example sentences
The uppermost wedge-shaped voussoir at the crown of an arch that locks the other voussoirs into place.
The windows have splayed voussoir, flat-arched lintels with keystones.
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