extrados /ek-strāˈdos/ (architecture)

1. The convex surface of an arch
2. The external curve of the keystone of an arch

• corneas
• corned
• corned beef
• cornel
• cornelian
• cornelian cherries
• cornelian cherry
• cornelians
• cornels
• cornemuse
• cornemuses
• corneous
• corner
• cornerback
• cornerbacks
• corner-boy
• corner-boys
• cornered
• cornering
• corner-man
• corner-men
• corners
• cornerstone
• cornerstones
• corner teeth