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
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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 for quoins
The corners of buildings are often emphasised by rusticated quoins.
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