Definition of black diamond noun from the Oxford Advanced Learner's Dictionary

     

    black diamond

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1[countable] (British English, informal) a lump of coal
  2. 2[uncountable, countable] a dark form of diamond
  3. 3[countable] (North American English) a slope that is difficult to ski down a black diamond run
See the Oxford Advanced American Dictionary entry: black diamond