The middle part of the alimentary canal from the stomach, or entrance of the bile duct, to, or including, the large intestine.

The central region of the crustacean gut. Unlike the fore and hind gut, this region lacks cuticle.

the central portion of the forming gastrointestinal tract (fore-, mid, hind-), opening on the ventral embryo surface into the yolk sac. In later development mid-duodenum to splenic flexure of colon. (More? Gastrointestinal Tract Notes)

The middle part of the intestine where the cockroach absorbs nutrients.

The midgut is the portion of the embryo from which most of the intestines are derived. After it bends around the superior mesenteric artery, it is called the "midgut loop". It originates from the foregut at the opening of the bile duct into the duodenum and continues through the small intestine and much of the large intestine until the transition to the hindgut about two-thirds of the way through the transverse colon.