The Collaborative International Dictionary of English v.0.48:

Intestinal \In*tes"ti*nal\, a. [Cf. F. intestinal.]
   Of or pertaining to the intestines of an animal; as, the
   intestinal tube; intestinal digestion; intestinal enzymes.
   [1913 Webster]

   Intestinal canal. Same as Intestine, n.

   Intestinal worm (Zool.), any species of helminth living in
      the intestinal canal of any animal. The species are
      numerous.
      [1913 Webster]