(architecture) Furnished with a quoin.

Any of the corner building blocks of a building, usually larger or more ornate than the surrounding blocks. / The keystone of an arch.

(transitive) To wedge or steady with quoins.

plural of quoin

present participle of quoin

(architecture) The architectural elements, such as stone or brick, that form a quoin

plural of quoining

The post of a canal's lock gate which abuts against the wall.

plural of quoin post