roof

(ro͞of, ro͝of)

1. a. The exterior surface and its supporting structures on the top of a building.
   b. The upper exterior surface of a dwelling as a symbol of the home itself: three generations living under one roof.
2. The top covering of something: the roof of a car.
3. The upper surface of an anatomical structure, especially one having a vaulted inner structure: the roof of the mouth.
4. The highest point or limit; the summit or ceiling: A roof on prices is needed to keep our customers happy.