from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The exterior surface and its supporting structures on the top of a building.
  • n. The upper exterior surface of a dwelling as a symbol of the home itself: three generations living under one roof.
  • n. The top covering of something: the roof of a car.
  • n. The upper surface of an anatomical structure, especially one having a vaulted inner structure: the roof of the mouth.
  • n. The highest point or limit; the summit or ceiling: A roof on prices is needed to keep our customers happy.
  • transitive v. To furnish or cover with or as if with a roof.
  • idiom go through the roof Slang To grow, intensify, or rise to an enormous, often unexpected degree: Operating costs went through the roof last year.
  • idiom go through the roof Slang To become extremely angry: When I told her about breaking the window, she went through the roof.
  • idiom raise the roof Slang To be extremely noisy and boisterous: They raised the roof at the party.
  • idiom raise the roof Slang To complain loudly and bitterly: Angry tenants finally raised the roof about their noisy neighbors.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The cover at top of a building.
  • n. The upper part of a cavity.
  • v. To cover or furnish with a roof.

from the GNU version of the Collaborative International Dictionary of English

  • n. The cover of any building, including the roofing (see roofing) and all the materials and construction necessary to carry and maintain the same upon the walls or other uprights. In the case of a building with vaulted ceilings protected by an outer roof, some writers call the vault the roof, and the outer protection the roof mask. It is better, however, to consider the vault as the ceiling only, in cases where it has farther covering.
  • n. That which resembles, or corresponds to, the covering or the ceiling of a house
  • n. The surface or bed of rock immediately overlying a bed of coal or a flat vein.
  • transitive v. To cover with a roof.
  • transitive v. To inclose in a house; figuratively, to shelter.

from The Century Dictionary and Cyclopedia

  • To cover with a roof, in any sense of that word.
  • To inclose in a house; shelter.
  • To arch or form like a roof.
  • An obsolete preterit of rive.
  • n. The external upper covering of a house or other building.
  • n. Anything which in form or position corresponds to or resembles the covering of a house, as the arch or top of a furnace or oven, the top of a carriage or coach or car, an arch or the interior of a vault, the ceiling of a room, etc.; hence, a canopy or the like.
  • n. A house.
  • n. The upper part of the mouth; the hard palate.
  • n. Figuratively, the loftiest part.
  • n. In geology, the overlying stratum.
  • n. In mining, the top of any subterranean excavation: little used except in coal-mining.
  • n. A roof but slightly inclined for the discharge of water. Roofs of this form are common in city buildings, especially in the United States, and are usually covered with sheet-metal.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the inner top surface of a covered area or hollow space
  • n. protective covering on top of a motor vehicle
  • v. provide a building with a roof; cover a building with a roof
  • n. a protective covering that covers or forms the top of a building
  • n. an upper limit on what is allowed


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Old English hrōf.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English rof, from Old English hrōf ("roof, ceiling; top, summit; heaven, sky"), from Proto-Germanic *hrōfan (“roof”), from Proto-Indo-European *krāpo- (“roof”), from Proto-Indo-European *krāwǝ- (“to cover, heap”). Cognate with Scots ruif ("roof"), Dutch roef ("a cabin, wooden cover, deckhouse"), Low German rof ("roof"), Icelandic hróf ("a shed under which ships are built or kept, roof of a boathouse").



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