noun

• (obsolete) The fat surrounding the belly.
• (anatomy) The belly, or that part of the body between the thorax and the pelvis, not including the back; or in some lower vertebrates, the portion between the cardiac and caudal regions.
• (anatomy) The cavity of the belly, which is lined by the peritoneum, and contains the viscera; often restricted in humans to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity.
• (zoology, entomology) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.