• (n.) Accumulation of air, or other gas, and of pus, in the pleural cavity.
(pi″o-noo″mo-thor´aks) pus and air or gas within the pleural cavity; called also pneumopyothorax.
Py`op·neu`mo·tho'rax noun [ Greek ... pus + English pneumothorax .] (Medicine) Accumulation of air, or other gas, and of pus, in the pleural cavity. 
Type: Term Pronunciation: pī′ō-nū′mō-thō′raks Definitions: 1. The presence of gas together with a purulent effusion in the pleural cavity.