The Collaborative International Dictionary of English v.0.48:

Eventration \E`ven*tra*tion\, n. [L. e out + venter belly.]
   (Med.)
   (a) A tumor containing a large portion of the abdominal
       viscera, occasioned by relaxation of the walls of the
       abdomen.
   (b) A wound, of large extent, in the abdomen, through which
       the greater part of the intestines protrude.
   (c) The act of disemboweling.
       [1913 Webster]

WordNet (r) 3.0 (2006):

eventration
    n 1: protrusion of the intestine through the abdominal wall