What does the word roof mean?

Usage examples for roof

  1. It was square, and had a roof over it like a house, with seats for the passengers below. – Rollo in Holland by Jacob Abbott
  2. It will be hard, but not so hard nor so bitter as living under the same roof with their father. – Dora Thorne by Charlotte M. Braeme
  3. Above him, within arm's reach, was the low roof of the building. – The Return of Tarzan by Edgar Rice Burroughs