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English word pyothorax comes from English thorax, English pyo- ((medicine) of or relating to pus.)
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thorax (English)
(anatomy) The region of the mammalian body between the neck and abdomen as well as the cavity containing the heart and lungs.. (entomology, and, arachnology) The middle of three distinct divisions in an insect, crustacean or arachnid body.
pyo- (English)
(medicine) of or relating to pus.
pyothorax (English)
Pleural empyema; an accumulation of pus in the pleural cavity.