Ceiling

of Ceil

The inside lining of a room overhead; the under side of the floor above; the upper surface opposite to the floor.

The lining or finishing of any wall or other surface, with plaster, thin boards, etc.; also, the work when done.

The inner planking of a vessel.

(meteorology) altitude of the lowest layer of clouds

an upper limit on what is allowed; "he put a ceiling on the number of women who worked for him"; "there was a roof on salaries"; "they established a cap for prices"