Main Entry: ¹quoin

Pronunciation: \ˈkȯin, ˈkwȯin\

Function: noun

Etymology: alteration of ¹coin

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 illustration]