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quoin also coign or coin (koin, kwoin)
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n.
1.
a. An exterior angle of a wall or other piece of masonry.
b. Any of the stones used in forming such an angle, often being of large size and dressed or arranged so as to form a decorative contrast with the adjoining walls.
c. A piece of wood or other material used as trim on the corner of a building in imitation of such a stone.
2. A keystone.
3. Printing A wedge-shaped block used to lock type in a chase.
4. A wedge used to raise the level of a gun.
tr.v. quoined, quoin·ing, quoins also coigned or coign·ing or coigns or coined or coin·ing or coins
To provide, secure, or raise with a quoin or quoins.

[Variant of COIN.]
(click for a larger image)
quoin
smooth-cut quoins

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
coin (koin)
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n.
1. A small piece of metal, usually flat and circular, authorized by a government for use as money.
2. Metal money considered as a whole.
3. A flat circular piece or object felt to resemble metal money: a pizza topped with coins of pepperoni.
4. A mode of expression considered standard: Two-word verbs are valid linguistic coin in the 20th century.
5. Variant of quoin.
tr.v. coined, coin·ing, coins
1. To make (pieces of money) from metal; mint or strike: coined silver dollars.
2. To make pieces of money from (metal): coin gold.
3. To devise (a new word or phrase).
adj.
Requiring one or more pieces of metal money for operation: a coin washing machine.
Idiom:
the other side of the coin
One of two differing or opposing views or sides.

[Middle English, from Old French, die for stamping coins, wedge, from Latin cuneus, wedge.]

coina·ble adj.
coiner n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.