I. ˈkȯin, ˈkwȯin noun
Etymology: alteration of coin (I)
Date: 1532
1.
a. : a solid exterior angle (as of a building)
b. : one of the members (as a block) forming a quoin and usually differentiated from the adjoining walls by material, texture, color, size, or projection
2. : the keystone or a voussoir of an arch
3. : a wooden or expandable metal block used by printers to lock up a form within a chase
[
quoin 1b
]
II. transitive verb
Date: 1683
1. : to equip (a type form) with quoins
2. : to provide with quoins
quoin ed walls