pneumomediastinum

noun
pneu·​mo·​me·​di·​as·​ti·​num | \ ˌn(y)ü-mō-ˌmēd-ē-ə-ˈstī-nəm How to pronounce pneumomediastinum (audio) \
plural pneumomediastina\ -​nə How to pronounce pneumomediastina (audio) \

Medical Definition of pneumomediastinum

1 : an abnormal state characterized by the presence of gas (as air) in the mediastinum
2 : the induction of pneumomediastinum as an aid to radiography

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