Definitions

from The Century Dictionary.

  • noun In sea-anemones and similar polyps, the main digestive cavity or stomach; in Mollusca, the stomach and intestine. Compare stomodæum and proctodæum.
  • noun In embryology, the interior of the archenteron or primitive intestine; the intestinal cavity in an early stage, bounded by the hypoblast.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy The midgut.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

meso- +‎ enteron

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Examples

  • They finally appear to (? entirely) obliterate the segmentation cavity -- they certainly do so throughout the body; and their cavities are in time cut off from the mesenteron, by the gradual constriction of their openings.

    Text Book of Biology, Part 1: Vertebrata 1906

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