The Collaborative International Dictionary of English v.0.48:

Discruciate \Dis*cru"ci*ate\, v. t. [imp. & p. p.
   Discruciated; p. pr. & vb. n. Discruciating.] [L.
   discruciatus, p. p. of discruciare. See Cruciate.]
   To torture; to excruciate. [Obs.]
   [1913 Webster]

         Discruciate a man in deep distress.      --Herrick.
   [1913 Webster]