extrados /ek-strāˈdos/ (architecture)

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

• watchful
• watchfully
• watchfulness
• watchfulnesses
• watchglass
• watchglasses
• watchguard
• watchguards
• watch house
• watch houses
• watch in
• watching
• watching brief
• watching briefs
• watch it
• watch key
• watch keys
• watch light
• watch lights
• watch like a hawk
• watch list
• watchmaker
• watchmakers
• watchmaking
• watchmakings