The Collaborative International Dictionary of English v.0.48:

innards \innards\ n.
   The internal organs of an animal collectively especially
   those in the abdominal cavity.

   Syn: viscera.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

innards
    n 1: internal organs collectively (especially those in the
         abdominal cavity); "`viscera' is the plural form of
         `viscus'" [syn: viscera, entrails, innards]