English

Definition of crux noun from the Oxford Advanced Learner's Dictionary

 

crux

 noun
noun
BrE BrE//krʌks//
 
; NAmE NAmE//krʌks//
 
 
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[singular] the crux (of something) the most important or difficult part of a problem or an issue synonym nub Now we come to the crux of the matter. Now we come to the crux of the matter. Word Origin mid 17th cent. (denoting a representation of a cross, chiefly in crux ansata ‘ankh’, literally ‘cross with a handle’): from Latin, literally ‘cross’.
See the Oxford Advanced American Dictionary entry: crux