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Abdomen, in vertebrates, large body cavity between the chest and the pelvis. It contains the stomach, intestines, liver, gallbladder (which are covered by the peritoneum, the thin membrane lining the cavity), kidneys, spleen, adrenal glands, pancreas, and, in the female, reproductive organs. In invertebrates, abdomen refers to the part of the body behind the thorax.

See also: Intestine; Stomach.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - A to Akutagawa, Ryunosuke