abdomen /ab″dəmən, abdō″mən/ [L, abdominis, belly] , the portion of the body between the thorax and the pelvis. The abdominal cavity is lined by the peritoneum; contains the inferior portion of the esophagus, the stomach, the intestines, the liver, the spleen, the pancreas, and other organs; and is bounded by the diaphragm and the pelvic cavity. See also abdominal regions. −abdominal, adj.
