pneumopericardium
noun
pneu·mo·peri·car·di·um
| \ ˌn(y)ü-mō-ˌper-ə-ˈkärd-ē-əm
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plural pneumopericardia\ -ē-ə
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Medical Definition of pneumopericardium
: an abnormal state characterized by the presence of gas (as air) in the pericardium