Encyclopædia Britannica, Ninth Edition/Empyema
EMPYEMA (from ἐν, within, and πῦον, pus), a term in medicine applied to an accumulation of purulent fluid within the cavity of the pleura (see Pleurisy).
EMPYEMA (from ἐν, within, and πῦον, pus), a term in medicine applied to an accumulation of purulent fluid within the cavity of the pleura (see Pleurisy).