[koin] 
[koin, kwoin] | 1. | an external solid angle of a wall or the like. |
| 2. | one of the stones forming it; cornerstone. |
| 3. | any of various bricks of standard shape for forming corners of brick walls or the like. |
| 4. | a wedge-shaped piece of wood, stone, or other material, used for any of various purposes. |
| 5. | Printing. a wedge of wood or metal for securing type in a chase. |
| 6. | to provide with quoins, as a corner of a wall. |
| 7. | to secure or raise with a quoin or wedge. |
