Webster’s Revised Unabridged Dictionary · 1913
Stomodæum
Stom′o·dæ′um, n. [NL., from Gr. ?, ?, mouth + ? to divide.] 1. (Anat.) A part of the alimentary canal. See under Mesenteron.
2. (Zoöl.) The primitive mouth and esophagus of the embryo of annelids and arthropods.