Definition of crux noun from the Oxford Advanced American Dictionary

     

    crux

     noun
    noun
    NAmE//krʌks//
     
    [singular]the crux (of something)
     
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  1. 1the most important or difficult part of a problem or an issue synonym heart (5)
  2. 2 Now we come to the crux of the matter.
See the Oxford Advanced Learner's Dictionary entry: crux