The Collaborative International Dictionary of English v.0.48:

Evisceration \E*vis`cer*a"tion\, a.
   A disemboweling.
   [1913 Webster]

WordNet (r) 3.0 (2006):

evisceration
    n 1: surgical removal of an organ (or the contents of an organ)
         from a patient
    2: the act of removing the bowels or viscera; the act of cutting
       so as to cause the viscera to protrude [syn:
       disembowelment, evisceration]
    3: altering something (as a legislative act or a statement) in
       such a manner as to reduce its value; "the adoption of their
       amendments would have amounted to an evisceration of the act"

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "evisceration":
   abatement, attenuation, attrition, blunting, damping, deadening,
   debilitation, devitalization, dilution, disembowelment, dulling,
   effemination, enervation, enfeeblement, exhaustion, extenuation,
   fatigue, gutting, inanition, languishment, mitigation, reduction,
   relaxation, slackening, softening, thinning, weakening