Meaning of “roof” in the English Dictionary

"roof" in British English

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roofnoun [ C ]

uk /ruːf/ us /ruːf/

A2 the covering that forms the top of a building, vehicle, etc.:

The house has a sloping/flat/tiled/thatched roof.
Put the luggage on the roof of the car.
The roof (= upper surface) of the cave is 50 metres up.
This cake is so dry that it sticks to the roof of your mouth (= upper surface of the mouth).

More examples

roofverb [ T often passive ]

uk /ruːf/ us /ruːf/

(Definition of “roof” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"roof" in American English

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roofnoun [ C ]

us /ruf, rʊf/

the covering that forms the top of a building, vehicle, or other object:

The school has a flat roof.

The roof of your mouth is the mouth’s upper, inside surface:

Peanut butter sticks to the roof of your mouth.
roof
verb [ T ] us /ruf, rʊf/

They roofed the house with old-fashioned shingles.

(Definition of “roof” from the Cambridge Academic Content Dictionary © Cambridge University Press)