Abbreviation for 'abdomen,' the part of the body containing the digestive and reproductive organs.
From Latin 'abdomen,' possibly derived from 'abdo' (to hide) because ancient Romans considered the belly a hidden or shame-worthy region; abbreviated in medical notation.
Doctors use 'abd' shorthand so much that it became its own word in medical charting—it's a perfect example of how professional jargon creates its own mini-language that insiders instantly recognize.
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