n. An external solid angle; specifically, in architecture and masonry, the external angle of a building.n. A wedge-like piece of stone, wood, metal, or other material, used for various purposes.n. In gem-cutting, any one of the four facets on the crown of a brilliant; also, any one of the four facets on the pavilion or base. These facets divide each portion of the brilliant into four parts. Also called lozenge. See cut under brilliant.n. Nautical, a wedge placed beneath a cask when stowed on shipboard, to prevent it from rolling.n. In gunnery, a wooden wedge used to hold a gun at a desired elevation.To wedge, steady, or raise with quoins, as a stone in building a wall, the types in a chase, etc.: generally with up. See quoin, n., 2.n. The solid angle of a crystal in which three or more faces meet. Also written coign.