1. (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase

• coign
• coigne

2. (noun) the keystone of an arch

• coign
• coigne

3. (noun) (architecture) solid exterior angle of a building; especially one formed by a cornerstone

• corner

1. (noun) (architecture) solid exterior angle of a building; especially one formed by a cornerstone

• architecture

1. (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase

• wedge

2. (noun) the keystone of an arch

• headstone
• key
• keystone

3. (noun) (architecture) solid exterior angle of a building; especially one formed by a cornerstone

• construction
• structure