‖Stom′o‐dæ″um (?), n. 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.