[roof, roof]
noun, plural roofs.
the external upper covering of a house or other building.
a frame for supporting this: an open-timbered roof.
the highest part or summit: The Himalayas are the roof of the world.
something that in form or position resembles the roof of a house, as the top of a car, the upper part of the mouth, etc.
a house.
Mining. the rock immediately above a horizontal mineral deposit.
verb (used with object)
to provide or cover with a roof.
go through the roof,
to increase beyond all expectations: Foreign travel may very well go through the roof next year.
Also, hit the roof. Informal. to lose one's temper; become extremely angry.
raise the roof, Informal.
to create a loud noise: The applause raised the roof.
to complain or protest noisily: He'll raise the roof when he sees that bill.

before 900; Middle English (noun); Old English hrōf; cognate with Dutch roef cover, cabin, Old Norse hrōf

rooflike, adjective
reroof, verb (used with object)
self-roofed, adjective
underroof, noun
unroofed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roof (ruːf)
n , pl roofs
1.  a.  a structure that covers or forms the top of a building
 b.  (in combination): the rooftop
 c.  (as modifier): a roof garden
2.  the top covering of a vehicle, oven, or other structure: the roof of a car
3.  anatomy any structure that covers an organ or part: the roof of the mouth
4.  a highest or topmost point or part: Mount Everest is the roof of the world
5.  a house or other shelter: a poor man's roof
6.  mountaineering the underside of a projecting overhang
7.  informal hit the roof, go through the roof
 a.  to get extremely angry; become furious
 b.  to rise or increase steeply
8.  raise the roof
 a.  to create a boisterous disturbance
 b.  to react or protest heatedly
9.  (tr) to provide or cover with a roof or rooflike part
[Old English hrōf; related to Middle Dutch, Old Norse hrōf]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. hrof "roof, ceiling, top," from P.Gmc. *khrofaz (cf. O.Fris. rhoof "roof," M.Du. roof "cover, roof," Du. roef "deckhouse, cabin, coffin-lid," M.H.G. rof "penthouse," O.N. hrof "boat shed"). No apparent connections outside Gmc. "English alone has retained the word in a general sense, for which the
other languages use forms corresponding to OE. þæc thatch" [OED]. The verb is from c.1475. Roof of the mouth is from late O.E. Raise the roof "create an uproar" is attested from 1860, originally in Southern Amer.Eng. Roofer "one who makes or repairs roofs" is from 1855.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

roof (rōōf, ruf)
The upper surface of an anatomical structure, especially one having a vaulted inner structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases


In addition to the idiom beginning with roof, also see go through the roof; hit the ceiling (roof); like a cat on hot bricks (a hot tin roof); raise the roof.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
And now that roof is rotting, threatening the structural integrity of the
In the background is the incongruous yet constant beat of a percussion section
  on the building's roof.
The proposed roof bubble detracts from the pure shape and statement of the
  building's original designers.
One did a lot of damage and dumped a couple of school buses on the roof of a
  school building.
Image for roof
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