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The Collaborative International Dictionary
Midgut

Midgut \Mid"gut`\, n. [Mid, a. + gut.] (Anat.) The middle part of the alimentary canal from the stomach, or entrance of the bile duct, to, or including, the large intestine.

Wiktionary
midgut

n. (context anatomy English) The central loop of the alimentary canal of an embryo between the foregut and the hindgut

Wikipedia
Midgut

The midgut is the portion of the embryo from which most of the intestines develop. After it bends around the superior mesenteric artery, it is called the "midgut loop". It comprises the portion of the alimentary canal from the end of the foregut at the opening of the bile duct to the hindgut, about two-thirds of the way through the transverse colon.