quoin

[koin, kwoin]
noun
1.
an external solid angle of a wall or the like.
2.
one of the stones forming it; cornerstone.
3.
any of various bricks of standard shape for forming corners of brick walls or the like.
4.
a wedge-shaped piece of wood, stone, or other material, used for any of various purposes.
5.
Printing. a wedge of wood or metal for securing type in a chase.
verb (used with object)
6.
to provide with quoins, as a corner of a wall.
7.
to secure or raise with a quoin or wedge.
Also, coign, coigne.


Origin:
1525–35; variant of coin

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quoin, coign or coigne (kwɔɪn, kɔɪn, kwɔɪn, kɔɪn, kwɔɪn, kɔɪn)
 
n
1.  an external corner of a wall
2.  Also called: cornerstone a stone forming the external corner of a wall
3.  another name for keystone
4.  printing a metal or wooden wedge or an expanding mechanical device used to lock type up in a chase
5.  a wedge used for any of various other purposes, such as (formerly) to adjust elevation in muzzle-loading cannon
 
[C16: variant of coin (corner)]
 
coign, coign or coigne
 
n
 
[C16: variant of coin (corner)]
 
coigne, coign or coigne
 
n
 
[C16: variant of coin (corner)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

quoin
1532, "a cornerstone," variant of coin (q.v.), originally in other senses of that word, too, including "a wedge."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was aimed simply by line of sight and elevated by a stepped wooden block called a quoin.
At the corners, bricks stand forth to form a quoin pattern vertically through the six stories.
They were used to move the carriage and to lift the breech of the gun so that the elevating quoin or screw might be adjusted.
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