Definition of "quoin"
noun:
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Any of the corner building blocks of a building, usually larger or more ornate than the surrounding blocks.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
The keystone of an arch.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A metal wedge which fits into the space between the type and the edge of a chase, and is tightened to fix the metal type in place.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A form of wedge used to prevent casks from moving.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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