Quoin

Definition:

(n.) Originally, a solid exterior angle, as of a building; now, commonly, one of the selected pieces of material by which the corner is marked.
(n.) A wedgelike piece of stone, wood metal, or other material, used for various purposes
(n.) to support and steady a stone.
(n.) To support the breech of a cannon.
(n.) To wedge or lock up a form within a chase.
(n.) To prevent casks from rolling.

Compare quoin with other words:

quoil vs. quoin

quoin vs. quoit

quoif vs. quoin

coigne vs. quoin

chase vs. quoin

quoin vs. wedge

keystone vs. quoin

block vs. quoin

ornate vs. quoin

corner vs. quoin

cornerstone vs. quoin