The Collaborative International Dictionary of English v.0.48:

Gut \Gut\, n. [OE. gut, got, AS. gut, prob. orig., a channel,
   and akin to ge['o]tan to pour. See FOUND to cast.]
   [1913 Webster]
   1. A narrow passage of water; as, the Gut of Canso.
      [1913 Webster]

   2. An intenstine; a bowel; the whole alimentary canal; the
      enteron; (pl.) bowels; entrails.
      [1913 Webster]

   3. One of the prepared entrails of an animal, esp. of a
      sheep, used for various purposes. See Catgut.
      [1913 Webster]

   4. The sac of silk taken from a silkworm (when ready to spin
      its cocoon), for the purpose of drawing it out into a
      thread. This, when dry, is exceedingly strong, and is used
      as the snood of a fish line.
      [1913 Webster]

   Blind gut. See Caecum, n.
      (b) .
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

caecum \cae"cum\, n.; pl. C[ae]cums, L. C[ae]ca. [L. caecus
   blind, invisible, concealed.] (Anat.)
   (a) A cavity open at one end, as the blind end of a canal or
       duct.
   (b) The blind part of the large intestine beyond the entrance
       of the small intestine; -- called also the blind gut.
       [Also spelled cecum.]
       [1913 Webster]

   Note: The c[ae]cum is comparatively small in man, and ends in
         a slender portion, the vermiform appendix; but in
         herbivorous mammals it is often as large as the rest of
         the large intestine. In fishes there are often numerous
         intestinal c[ae]ca.
         [1913 Webster]

WordNet (r) 3.0 (2006):

blind gut
    n 1: the cavity in which the large intestine begins and into
         which the ileum opens; "the appendix is an offshoot of the
         cecum" [syn: cecum, caecum, blind gut]