abdominal cavity

space inside the abdomen, space where the stomach liver and other organs are located

The abdominal cavity is the body cavity of the human body (and other animal bodies) that holds the bulk of the viscera and which is located below (or inferior to) the thoracic cavity, and above the pelvic cavity.Organs of the abdominal cavity include the stomach, liver, gallbladder, spleen, pancreas, urinary bladder, small intestine and large intestine. (The kidneys are located not in the abdominal cavity but behind it, in the retroperitoneum.)The abdominal cavity is lined with a protective membrane termed the peritoneum. The viscera are also covered, in the front, with a fatty layer called the omentum (or omental apron).
See more at Wikipedia.org...

Abdominal cavity n. The space bounded by the abdominal walls, diaphragm, and pelvis and containing most of the organs of digestion, the spleen, the [more]Abdominal cavity - Community and Resources

Noun
1. the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm
(synonym) abdomen
(hypernym) cavity, bodily cavity, cavum
(part-holonym) abdomen, venter, stomach, belly

The space between the abdominal wall and the spine.