- an external solid angle of a wall or the like.
- one of the stones forming it; cornerstone.
- any of various bricks of standard shape for forming corners of brick walls or the like.
- a wedge-shaped piece of wood, stone, or other material, used for any of various purposes.
- a wedge of wood or metal for securing type in a chase.
- to provide with quoins, as a corner of a wall.
- to secure or raise with a quoin or wedge.
- an external corner of a wall
- a stone forming the external corner of a wall
- another name for keystone (def. 1)
- a metal or wooden wedge or an expanding mechanical device used to lock type up in a chase
- a wedge used for any of various other purposes, such as (formerly) to adjust elevation in muzzle-loading cannon
