hemothorax

noun
he·​mo·​tho·​rax
variants: or chiefly British haemothorax \ ˌhē-​mə-​ˈthō(ə)r-​ˌaks, -​ˈthȯ(ə)r-​ \
plural hemothoraxes or hemothoraces\ -​ˈthōr-​ə-​ˌsēz, -​ˈthȯr-​ \

Medical Definition of hemothorax 

: blood in the pleural cavity

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