pneu·mo·me·di·as·ti·num noun \ˌn(y)ü-mō-ˌmēd-ē-ə-ˈstī-nəm\
plural pneu·mo·me·di·as·ti·na \-nə\
: an abnormal state characterized by the presence of gas (as air) in the mediastinum
: the induction of pneumomediastinum as an aid to radiography
Seen & Heard
What made you want to look up pneumomediastinum? Please tell us where you read or heard it (including the quote, if possible).