Definition of black diamond noun from the Oxford Advanced American Dictionary

     

    black diamond

     noun
    noun
     
     
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  1. 1 [countable] (informal) a lump of coal
  2. 2[uncountable, countable] a dark form of diamond
  3. 3 [countable] a slope that is difficult to ski down a black diamond run
See the Oxford Advanced Learner's Dictionary entry: black diamond