The Collaborative International Dictionary of English v.0.48:

Entrails \En"trails\, n. pl. [F. entrailles, LL. intralia,
   intranea, fr. interaneum, pl. interanea, intestine,
   interaneus inward, interior, fr. inter between, among,
   within. See Internal.]
   1. The internal parts of animal bodies; the bowels; the guts;
      viscera; intestines.
      [1913 Webster]

   2. The internal parts; as, the entrails of the earth.
      [1913 Webster]

            That treasure . . . hid the dark entrails of
            America.                              --Locke.
      [1913 Webster]

WordNet (r) 3.0 (2006):

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