- Noun. The belly, or that part of the body between the thorax and the pelvis.
- Noun. (anatomy) The cavity of the belly, which is lined by the peritoneum, and contains the stomach, bowels, and other viscera; often restricted in humans to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity.
- Noun. (zoology) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda.