One of the mysteries of the English language finally explained.
1The presence of air or gas in the peritoneal cavity (usually as a result of perforation of a hollow viscus).
2More fully "artificial pneumoperitoneum". The deliberate introduction of air or gas into the peritoneal cavity, as a diagnostic or therapeutic procedure (now chiefly as an aid to laparoscopy); the condition created by this.
Late 19th century. From pneumo- + peritoneum.
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