Roof (noun)

1. The covering on the uppermost part of a building, vehicle, or other structure, typically made of tiles or sheets of metal, that protects the interior from the weather.
2. The highest point of something.
3. The top or upper surface of something.

Origin:

Old english rōf; related to dutch roef and german dach.

Examples:

1. The roof needs to be repaired.
2. The roof of the house was made of clay tiles.
3. The roof of the car was open.
4. He stood on the roof of the skyscraper.
5. The roof of the cave was covered in stalactites.