Quoin

·noun to support and steady a stone.

II. Quoin ·noun To prevent casks from rolling.

III. Quoin ·noun To support the breech of a cannon.

IV. Quoin ·noun To wedge or lock up a form within a chase.

V. Quoin ·noun A wedgelike piece of stone, wood metal, or other material, used for various purposes.

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