Webster's English Dictionary

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crux

crux \'kr*ks, 'kru.ks\ \'kru:-.se-z\ n or crux.es also cru.ces [L cruc-, 
   crux cross, torture - more at RIDGE] pl  1a: a puzzling or difficult 
   problem : unsolved question  1b: a determinative point at issue  2: a main 
   or central feature