Definition of rock noun from the Oxford Advanced American Dictionary

      

    rock

     noun
    noun
    NAmE//rɑk//
     
     
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    hard material
  1. 1[uncountable, countable] the hard, solid material that forms part of the surface of the earth and some other planets They drilled through several layers of rock to reach the oil. a cave with striking rock formations (= shapes made naturally from rock) The tunnel was blasted out of solid rock. volcanic/igneous/sedimentary, etc. rocks
  2. 2[countable] a mass of rock standing above the earth's surface or in the ocean the Rock of Gibraltar The ship crashed into the rocks at Point Joe, the scene of several shipwrecks.
  3. 3[countable] a large single piece of rock They clambered over the rocks at the foot of the cliff. The sign said “Danger: falling rocks.”
  4. stone
  5. 4 [countable] a small stone Protesters pelted the soldiers with rocks.
  6. music
  7. 5(also rock music) [uncountable] a type of loud popular music with a strong beat developed in the 1960s, and played on electric guitars and drums punk rock a rock band/star
  8. jewel
  9. 6 [countable, usually plural] (informal) a precious stone, especially a diamond
  10. person
  11. 7[countable, usually singular] a person who is emotionally strong and who you can rely on He is my rock.
  12. Idioms
    (caught/stuck) between a rock and a hard place
     
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    in a situation where you have to choose between two things, both of which are unpleasant
      on the rocks
       
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    1. 1a relationship or business that is on the rocks is having difficulties and is likely to fail soon Sue's marriage is on the rocks.
    2. 2(of drinks) served with pieces of ice but no water Scotch on the rocks
    (as) steady as a rock
     
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    extremely steady and calm; that you can rely on
See the Oxford Advanced Learner's Dictionary entry: rock