<p><strong>Noun:</strong></p><ul><li>An external solid angle of a wall or the like.</li><li>One of the stones forming it; cornerstone.</li><li>Any of various bricks of standard shape for forming corners of brick walls or the like.</li><li>A wedge-shaped piece of wood, stone, or other material, used for any of various purposes.</li><li>A wedge of wood or metal for securing type in a chase.</li></ul><p><strong>Verb:</strong></p><ul><li>To provide with quoins, as a corner of a wall.</li><li>To secure or raise with a quoin or wedge.</li></ul><p><strong>End of Response</strong></p>