Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The middle section of the digestive tract in a vertebrate embryo from which the ileum, jejunum, and portions of the duodenum and colon develop.
  • noun The middle portion of the digestive tract of certain invertebrates, such as arthropods, lined with an enzyme-secreting tissue and serving as the main site of digestion and absorption.

from The Century Dictionary.

  • noun See gut and mesogaster.

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

  • noun (Anat.) The middle part of the alimentary canal from the stomach, or entrance of the bile duct, to, or including, the large intestine.

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

  • noun anatomy The central loop of the alimentary canal of an embryo between the foregut and the hindgut

Etymologies

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