mesogaster

from The Century Dictionary.

• noun An inter mediate part of the intestine, extending from the pylorus to the cæcum, and including the small intestine with its annexes, as the liver and pancreas, also, in the fetus, the umbilical vesicle. It is commonly called the mid-gut.
• noun [capitalized] A genus of fossil fishes.

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

• noun (Anat.) The fold of peritoneum connecting the stomach with the dorsal wall of the abdominal cavity; the mesogastrium.

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

• noun anatomy The fold of peritoneum connecting the stomach with the dorsal wall of the abdominal cavity; the mesogastrium.