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roof

[roof, roo f]
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noun, plural roofs.
  1. the external upper covering of a house or other building.
  2. a frame for supporting this: an open-timbered roof.
  3. the highest part or summit: The Himalayas are the roof of the world.
  4. 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.
  5. a house.
  6. Mining. the rock immediately above a horizontal mineral deposit.
verb (used with object)
  1. to provide or cover with a roof.
Idioms
  1. go through the roof,
    1. to increase beyond all expectations: Foreign travel may very well go through the roof next year.
    2. Also hit the roof,Informal.to lose one's temper; become extremely angry.
  2. raise the roof, Informal.
    1. to create a loud noise: The applause raised the roof.
    2. to complain or protest noisily: He'll raise the roof when he sees that bill.

Origin of roof

before 900; Middle English (noun); Old English hrōf; cognate with Dutch roef cover, cabin, Old Norse hrōf
Related formsroof·like, adjectivere·roof, verb (used with object)self-roofed, adjectiveun·der·roof, nounun·roofed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for roofs

roof

noun plural roofs (ruːfs, ruːvz)
    1. a structure that covers or forms the top of a building
    2. (in combination)the rooftop
    3. (as modifier)a roof garden
  1. the top covering of a vehicle, oven, or other structurethe roof of a car
  2. anatomy any structure that covers an organ or partthe roof of the mouth
  3. a highest or topmost point or partMount Everest is the roof of the world
  4. a house or other sheltera poor man's roof
  5. mountaineering the underside of a projecting overhang
  6. hit the roof or go through the roof informal
    1. to get extremely angry; become furious
    2. to rise or increase steeply
  7. raise the roof
    1. to create a boisterous disturbance
    2. to react or protest heatedly
verb
  1. (tr) to provide or cover with a roof or rooflike part
Derived Formsroofer, nounroofless, adjectiverooflike, adjective

Word Origin

Old English hrōf; related to Middle Dutch, Old Norse hrōf
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for roofs

roof

n.

Old English hrof "roof, ceiling, top, summit; heaven, sky," also figuratively, "highest point of something," from Proto-Germanic *khrofam (cf. Old Frisian rhoof "roof," Middle Dutch roof, rouf "cover, roof," Dutch roef "deckhouse, cabin, coffin-lid," Middle High German rof "penthouse," Old Norse hrof "boat shed").

No apparent connections outside Germanic. "English alone has retained the word in a general sense, for which the other languages use forms corresponding to OE. þæc thatch" [OED]. Roof of the mouth is from late Old English. Raise the roof "create an uproar" is attested from 1860, originally in U.S. Southern dialect.

roof

v.

early 15c., from roof (n.). Related: Roofed; roofing.

Online Etymology Dictionary, © 2010 Douglas Harper

roofs in Medicine

roof

(rōōf, ruf)
n.
  1. 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.

Idioms and Phrases with roofs

roof

In addition to the idiom beginning with roof

also see:

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.