From The Collaborative International Dictionary of English v.0.48:

Crucial \Cru"cial\ (kr?"shal), a. [F. crucial, fr. L. crux,
   crucis, cross, torture. See Cross.]
   1. Having the form of a cross; appertaining to a cross;
      cruciform; intersecting; as, crucial ligaments; a crucial
      [1913 Webster]

   2. Severe; trying or searching, as if bringing to the cross;
      decisive; as, a crucial test.
      [1913 Webster]
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