ˌn(y)üməˈnäləsə̇s noun
Etymology: New Latin, from pneumon- + -lysis
: surgical freeing of the pleura so as to permit collapse of a lung involving (1) separation of the parietal pleura from the fascia of the chest wall or (2) separation of the visceral and parietal layers of pleura — called also (1) external pneumonolysis, (2) internal pneumonolysis