[roof, roo f]

noun, plural roofs.

verb (used with object)

to provide or cover with a roof.

Nearby words

  1. rood loft,
  2. rood screen,
  3. rood spire,
  4. roodepoort,
  5. roodepoort-maraisburg,
  6. roof garden,
  7. roof iris,
  8. roof of fourth ventricle,
  9. roof of the world,
  10. roof of tympanum


    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, lose one's temper; become extremely angry.
    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 forms Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for roof

British Dictionary definitions for 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
the top covering of a vehicle, oven, or other structurethe roof of a car
anatomy any structure that covers an organ or partthe roof of the mouth
a highest or topmost point or partMount Everest is the roof of the world
a house or other sheltera poor man's roof
mountaineering the underside of a projecting overhang
hit the roof or go through the roof informal
  1. to get extremely angry; become furious
  2. to rise or increase steeply
raise the roof
  1. to create a boisterous disturbance
  2. to react or protest heatedly


(tr) to provide or cover with a roof or rooflike part
Derived Formsroofer, nounroofless, adjectiverooflike, adjective

Word Origin for roof

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 roof
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for 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.

Idioms and Phrases with roof


In addition to the idiom beginning with roof

  • roof over one's head, a

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