Definitions from Wiktionary (quoin)

▸ noun:  Any of the corner building blocks of a building, usually larger or more ornate than the surrounding blocks.
▸ noun:  The keystone of an arch.
▸ noun:  (printing, historical) 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.
▸ noun:  (obsolete, nautical) A form of wedge used to prevent casks from moving
▸ noun:  (firearms) A wedge of wood or iron put under the breech of heavy guns or the muzzle of siege-mortars to raise them to the proper level.
▸ noun:  (horticulture) A number of apple varieties with a distinctive ribbed appearance, like corners of a coin.
▸ verb:  (transitive) To wedge or steady with quoins.





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