skewback

[skyoo-bak]
noun Architecture.
1.
a sloping surface against which the end of an arch rests.
2.
a stone, course of masonry, or the like, presenting such a surface.

Origin:
1695–1705; skew + back1

skewbacked, adjective
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World English Dictionary
skewback (ˈskjuːˌbæk)
 
n
1.  the sloping surface on both sides of a segmental arch that takes the thrust
2.  one or more stones that provide such a surface
 
'skewbacked
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The structure was designed to act under dead load as a three-hinged arch and under live load as an arch with skewback hinges only.
Unless otherwise provided, pours in all abutments for an arch bridge shall be continuous from the top of footing to the skewback.
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