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rock - definition and synonyms


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noun rock pronunciation in British English /rɒk/
Word Forms
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  1. 1
    [uncountable] the hard solid substance that forms part of the Earths surface
    Rainwater flows through soil and porous rock to reach underground streams.
    We had to dig down through a twelve-inch layer of rock.
    1. a.
      [countable] a large piece of stone that rises up from the ground or from under the sea
      a castle built on a big rock
      the Rock of Gibraltar
    2. b.
      [countable] a large piece of stone lying on the ground
      She ran over the fallen rocks towards him.
    3. c.


      [plural] a group of rocks along the edge of the land or under the surface of the sea
      The waves crashed against the rocks.
    4. d.
      [countable] American a small stone
      Protesters threw rocks at the police.
  2. 2



    rock music

    [uncountable] rock music
    a rock star
    rock concerts
  3. 4
    [countable] informal a jewel, especially a diamond



a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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