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noun the region of the body of a vertebrate between the thorax and the pelvis
noun the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm
originFirst attested in 1541 as labdomen. Borrowed from Middle French abdomen as well as from its etymon Latin abdōmen, possibly from abdō (“conceal”), from ab (“away”) + -dō (“put, place”).
Etymology from Wiktionary, CC BY-SA 3.0