Definition of heavy metal noun from the Oxford Advanced American Dictionary

     

    heavy metal

     noun
    noun
     
     
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  1. 1[uncountable] a type of rock music with a very strong beat played very loud on electric guitars
  2. 2[countable] (technology) a metal that has a very high density (= the relation of its weight to its volume), such as gold or lead 2
See the Oxford Advanced Learner's Dictionary entry: heavy metal