mesogastric

from The Century Dictionary.

• Of or pertaining to the meso-gastrium; umbilical, as a region of the abdomen; mesenteric with reference to the stomach or to the mesogaster.
• In Crustacea, situated. in the middle of the gastric lobe of the carapace: specifically applied to a median subdivision of that lobe, the mesogastric lobe. See cut, under Brachyura.

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

• adjective Of or pertaining to the middle region of the abdomen, or of the stomach.
• adjective Of or pertaining to the mesogaster.
• adjective (Zoöl.) Of or pertaining to the middle gastric lobe of the carapace of a crab.

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

• adjective anatomy Of or pertaining to the middle region of the abdomen, or of the stomach.
• adjective anatomy Of or pertaining to the mesogaster.
• adjective zoology Of or pertaining to the middle gastric lobe of the carapace of a crab.