Did you know?

Click any word in a definition or example to find the entry for that word

roof - definition and synonyms

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

noun [countable]     roof pronunciation in American English
Word Forms
pluralroofs or rooves
  1. 1
    the top outer part of a building

    The roof is leaking again.

    a thatched roof (=made of straw)

    1. a.
      the top outer part of a vehicle

      One man had climbed onto the roof of his car.

    2. b.
      the top outer part of a temporary structure

      Rain pattered on the roof of the tent.

  2. 2
    the highest part of an underground area or structure

    rock formations on the roof of the cave

  3. 3
    the hard top part of the inside of your mouth
quiz invitation


a combination of a hotdog and a hamburger in a specially designed bread bun

BuzzWord Article

Open Dictionary

patio diplomacy

high-level diplomats meeting and dining in an informal environment e.g. a party or club

add a word


A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play