skewback
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skew·back
(skyo͞o′băk′)n.
Either of two inset abutments sloped to support an arch.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
skewback
(ˈskjuːˌbæk)n
1. (Architecture) the sloping surface on both sides of a segmental arch that takes the thrust
2. (Architecture) one or more stones that provide such a surface
ˈskewˌbacked adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
skew•back
(ˈskyuˌbæk)n.
a sloping surface against which the end of an arch rests.
[1695–1705]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.