Etymology
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abdomen (n.)

1540s, "flesh or meat of the belly" (a sense now obsolete), from Latin abdomen "the belly," a word of unknown origin, Perhaps [OED, Watkins] from abdere "conceal" (from ab "off, away" + PIE root *dhe- "to set, put"), with a sense of "concealment of the viscera," or else "what is concealed" by proper dress. De Vaan, however, finds this derivation "unfounded." Anatomical sense of "part of the mammalian body between the diaphragm and the pelvis" is from 1610s. Zoological sense of "posterior division of the bodies of arthropods" is by 1725.

Origin and meaning of abdomen

updated on September 11, 2022

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Definitions of abdomen from WordNet

abdomen (n.)
the region of the body of a vertebrate between the thorax and the pelvis;
Synonyms: venter / stomach / belly
abdomen (n.)
the cavity containing the major viscera; in mammals it is separated from the thorax by the diaphragm;
Synonyms: abdominal cavity
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.