GNU Collaborative International Dictionary of English

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Found one definition

1.       
   ‖Crux , n.; pl. E.  Cruxes , L.  Cruces . [L., cross, torture, trouble.] Anything that is very puzzling or difficult to explain.
   Dr. Sheridan.
   
   1913 Webster
   The perpetual crux of New Testament chronologists.
   Strauss.
   
   1913 Webster