The Collaborative International Dictionary of English v.0.48:

Enterotomy \En`ter*ot"o*my\, n. [Gr. 'e`nteron an intestine +
   te`mnein to cut.] (Med.)
   Incision of the intestines, especially in reducing certain
   cases of hernia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enterotomy
    n 1: surgical operation that creates a permanent opening through
         the abdominal wall into the intestine [syn: enterostomy,
         enterotomy]