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1. Expandable metal or wooden wedge used by printers to lock up a form within a chase
   - coign, coigne
    
2. The keystone of an arch
   - coign, coigne
    
3. (architecture) solid exterior angle of a building; especially one formed by a cornerstone
   - corner

Sounds like: coin, coign, coigne

Derived forms: quoins

Type of: construction, headstone, key, keystone, structure, wedge

Part of: building, edifice

Encyclopedia: Quoin