A hernia or swelling that protrudes through the abdominal wall.
From Greek koilia (belly) and onkos (mass, tumor, or swelling). This older medical term describes the bulge caused by abdominal contents pushing through weakened muscles.
Hernias were such a common problem in ancient times that they're mentioned in some of the earliest medical texts, and surgeons were already attempting repairs over 2,000 years ago using surprisingly sophisticated techniques.
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