Cru'cial, a.

(krū'shal, 32), a. [Fr. crucial, from Lat. crux, crucis, cross, torture, cruciare, to crucify, to torture.]

1. Having the form of a cross; appertaining to a cross; transverse; intersecting. “A crucial incision.” Dunglison.
2. Severe; trying or searching, as if bringing to the cross; as, a crucial experiment.

And from the imagination’s crucial heat Catch up their men and women all a-flame For action. E. B. Browning.