ceiling (redirected from Concave ceiling)

ceiling

Overhead surface of a room, and the underside of a floor or roof. Suspended ceilings, which hang from the beams above, are used to conceal construction, mechanical equipment, wiring, and light fixtures. During the Renaissance, ceilings were often coffered (see coffer), vaulted (see vault), or transformed into one large framed painting.

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ceiling

1. the inner upper surface of a room

2. 

a. an upper limit, such as one set by regulation on prices or wages

b. (as modifier): ceiling prices

3. the upper altitude to which an aircraft can climb measured under specified conditions

4. Meteorol the highest level in the atmosphere from which the earth's surface is visible at a particular time, usually the base of a cloud layer

5. a wooden or metal surface fixed to the interior frames of a vessel for rigidity

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ceiling [′sē·liŋ]

(building construction)

The covering made of plaster, boards, or other material that constitutes the overhead surface in a room.

(mathematics)

The smallest integer that is equal to or greater than a given real numbera; symbolized ⌈a⌉.

(meteorology)

In the United States, the height ascribed to the lowest layer of clouds or of obscuring phenomena when it is reported as broken, overcast, or obscuration and not classified as thin or partial.