Source : Webster's Revised Unabridged Dictionary (1913)

Mesenteron \Mes*en"te*ron\, n. [NL. See {Meso-}, and {Enteron}.]
   (Anat.)
   All that part of the alimentary canal which is developed from
   the primitive enteron and is lined with hypoblast. It is
   distinguished from the stomod?um, a part at the anterior end
   of the canal, including the cavity of the mouth, and the
   proctod?um, a part at the posterior end, which are formed by
   invagination and are lined with epiblast.