carapace /karˈə-pās/

1. The thick hard shell, made of bone or chitin, of the crab, tortoise, turtle, etc
2. A layer of heat-resistant tiles on a spacecraft
3. An inpenetrable outer shell, eg a reserved manner used as a protection against outside influences

• airhead
• airheads
• air hockey
• airhole
• airholes
• air hostess
• air hostesses
• air-house
• air-houses
• airier
• airiest
• airily
• airiness
• airinesses
• airing
• airing cupboard
• airing cupboards
• airings
• air-intake
• air-intakes
• approvances
• approve
• approved
• approved school
• approved schools