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Voussoir
from Building Language
by Eric Chau
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8. VOUSSOIR /voo ˈ -swär/ ⬗Voussoir is a wedge-shaped element, typically a stone, which is used in building anarchorvault ⬗The keystone is the centrestone or masonry unit at the apex of an arch ⬗The springer is the lowestvoussoir on each side, located where the curve of the arch springs from the vertical support or abutment of the wall orpier