1. Originally, a solid exterior angle, as of a building; now, commonly, one of the selected pieces of material by which the corner is marked.

In stone, the quoins consist of blocks larger than those used in the rest of the building, and cut to dimension. In brickwork, quoins consist of groups or masses of brick laid together, and in a certain imitation of quoins of stone.

2. A wedgelike piece of stone, wood metal, or other material, used for various purposes, as: To prevent casks from rolling. Hollow quoin. See Hollow. Quoin post, the post of a lock gate which abuts against the wall.

See: Coin, and cf. Coigne.

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