8. VOUSSOIR
/vo͞oˈ-swär/
⬗Voussoir is a wedge-shaped element, typically a stone, which is used in building an arch or vault
⬗The keystone is the centre stone or masonry unit at the apex of an arch ⬗The springer is the lowest voussoir on each side, located where the curve of the arch springs from the vertical support or abutment of the wall or pier
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