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quoin

[koin, kwoin] /kɔɪn, kwɔɪn/
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 of quoin
1525-1535
First recorded in 1525-35; variant of coin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for quoins

quoin

/kwɔɪn; kɔɪn/
noun
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 (sense 1)
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
Word Origin
C16: variant of coin (corner)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for quoins

quoin

n.

1530s, "a cornerstone," variant spelling of coin (n.); in early use also in other senses of that word, including "a wedge."

Online Etymology Dictionary, © 2010 Douglas Harper
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15
17
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