the middle portion of the vertebrate alimentary canal, posterior to the stomach or gizzard and extending to the cecum, functioning in the digestion and absorption of food; the small intestine.
the anterior portion of the arthropod colon, composed of endodermal tissue.
Embryology. the middle part of the embryonic alimentary canal from which the intestines develop.
Compare foregut, hindgut.

1870–75; mid- + gut

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World English Dictionary
midgut (ˈmɪdˌɡʌt)
1.  the middle part of the digestive tract of vertebrates, including the small intestine
2.  the middle part of the digestive tract of arthropods

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Medical Dictionary

midgut mid·gut (mĭd'gŭt')

  1. The middle section of the digestive tract in a vertebrate embryo from which the ileum, jejunum, and portions of the duodenum and colon develop. Also called mesenteron.

  2. The middle portion of the digestive tract of certain invertebrates, such as arthropods, that is lined with an enzyme-secreting tissue and that serves as the main site of digestion and absorption.

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