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:

Gut \Gut\, v. t. [imp. & p. p. Gutted; p. pr. & vb. n.
   Gutting.]
   1. To take out the bowels from; to eviscerate.
      [1913 Webster]

   2. To plunder of contents; to destroy or remove the interior
      or contents of; as, a mob gutted the house.
      [1913 Webster]

            Tom Brown, of facetious memory, having gutted a
            proper
            name of its vowels, used it as freely as he pleased.
                                                  --Addison.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gut
    n 1: the part of the alimentary canal between the stomach and
         the anus [syn: intestine, bowel, gut]
    2: a narrow channel or strait
    3: a strong cord made from the intestines of sheep and used in
       surgery [syn: catgut, gut]
    v 1: empty completely; destroy the inside of; "Gut the building"
    2: remove the guts of; "gut the sheep"