Encyclopædia Britannica, Ninth Edition/Empyema

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See also Empyema on Wikipedia; Empyema on Wikipedia; Empyema in the 11th Edition; and the disclaimer.

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).