pneumoperitoneum

noun
pneu·​mo·​peri·​to·​ne·​um | \-ˌper-ət-ᵊn-ˈē-əm \
plural pneumoperitoneums or pneumoperitonea\-​ˈē-​ə \

Medical Definition of pneumoperitoneum 

1 : an abnormal state characterized by the presence of gas (as air) in the peritoneal cavity

2 : the induction of pneumoperitoneum as a therapeutic measure or as an aid to radiography

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