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quoin
noun
- the external corner of a building; esp., any of the large, squared stones by which the corner of a building is marked
- a wedgelike piece of stone, etc., such as the keystone or one of the pieces of an arch
- a wedge-shaped wooden or metal block used to lock up type in a galley or form, to keep casks from rolling, etc.
transitive verb
- to secure with a quoin
- to furnish with quoins, or corners
See quoin in American Heritage Dictionary 4
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