Meaning

• The external covering at the top of a building.

  "The roof was blown off by the tornado."

• The top external level of a building.

  "Let's go up to the roof."

• The upper part of a cavity.

  "The palate is the roof of the mouth."

• The surface or bed of rock immediately overlying a bed of coal or a flat vein.

• (rockclimbing) An overhanging rock wall