The fat surrounding the belly.
The cavity of the belly, which is lined by the peritoneum, and contains the viscera; often restricted in humans to the part between the diaphragm and the commencement of the pelvis, the remainder being called the pelvic cavity.
He was all bent over complaining of pains in the abdomen.
First attested in 1541. Borrowed from Middle French abdomen, from Latin abdomen, possibly from abdō (“conceal”), from ab (“away”) + -dō (“put, place”).
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