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hy·dro·pneu·mo·tho·rax | \ ˌhī-drə-ˌn(y)ü-mə-ˈthō(ə)r-ˌaks, -ˈthȯ(ə)r- 
\
\ plural hydropneumothoraxes or hydropneumothoraces\ -ˈthōr-ə-ˌsēz, -ˈthȯr- \
\Medical Definition of hydropneumothorax
: the presence of gas and serous fluid in the pleural cavity
— called also pneumohydrothorax
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