Source : Webster's Revised Unabridged Dictionary (1913)

Stomodaeum \Stom`o*d[ae]"um\, n. [NL., from Gr. ?, ?, mouth + ?
   to divide.]
   1. (Anat.) A part of the alimentary canal. See under
      {Mesenteron}.

   2. (Zo["o]l.) The primitive mouth and esophagus of the embryo
      of annelids and arthropods.