quoin /koin/

1. A salient angle, esp of a building
2. A cornerstone, esp a dressed cornerstone
3. A keystone
4. A voussoir (qv)
5. A wedge, esp for locking type in a chase, or for raising a gun

1. To wedge
2. To secure or raise by wedging

quoinˈing noun

• water cask
• water cell
• water cells
• water cement
• water chestnut
• water chestnuts
• water chute
• water chutes
• water clerk
• water clerks
• water clock
• water clocks
• water closet
• water closets
• water cock
• water cocks
• watercolor
• watercolorist
• watercolorists
• watercolors
• waterpox
• waterpoxes
• water privilege
• water privileges
• waterproof