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pneumoperitoneum

(nōō′mō-pĕr′ĭ-tn-ēəm)
n.
  1. The presence of air or gas in the peritoneal cavity as a result of disease or for the treatment of certain conditions.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.