- the part of the body of a vertebrate containing the digestive organs; the belly. In humans and other mammals, it is bounded by the diaphragm and the pelvis.；the posterior part of the body of an arthropod, especially the segments of an insect's body behind the thorax.
noun: abdomen, plural noun: abdomens
- a condition of severe abdominal pain, usually requiring emergency surgery, caused by acute ... acute appendicitis is the most common cause of an acute abdomen requiring surgery
- the part of the body of a vertebrate containing the digestive and reproductive organs; the belly.