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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) quoinsmooth-cut quoins |
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