‖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 stomodæum, a part at the anterior end of the canal, including the cavity of the mouth, and the proctodæum, a part at the posterior end, which are formed by invagination and are lined with epiblast.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.