enteron

from WordNet (r) 3.0 (2006)

enteron
    n 1: the alimentary canal (especially of an embryo or a
         coelenterate)

from The Collaborative International Dictionary of English v.0.48

Enteron \En"te*ron\, n. [NL., fr. Gr. 'e`nteron an intestine,
   fr. 'ento`s within.] (Anat.)
   The whole alimentary, or enteric, canal.
   [1913 Webster]