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Answer for the clue "A collection of pus in a body cavity (especially in the lung cavity) ", 7 letters:
empyema

Word definitions for empyema in dictionaries

Wikipedia Word definitions in Wikipedia
An empyema (from Greek ἐμπύημα, "abscess") is a collection or gathering of pus within a naturally existing anatomical cavity. For example, pleural empyema is empyema of the pleural cavity . It must be differentiated from an abscess , which is a collection ...

Wiktionary Word definitions in Wiktionary
n. (context medicine English) A collection of pus within a naturally existing anatomical cavity (as opposed to an abscess, which occurs in a newly formed cavity).

WordNet Word definitions in WordNet
n. a collection of pus in a body cavity (especially in the lung cavity)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Empyema \Em`py*e"ma\, n. [NL., fr. Gr. ?, from ? to suppurate; ? in + ? pus.] (Med.) A collection of blood, pus, or other fluid, in some cavity of the body, especially that of the pleura. --Dunglison. Note: The term empyema is now restricted to a collection ...

Usage examples of empyema.

He got along well until about February—six months after it all started—and then he developed empyema in his left chest.

Once he caught a glimpse of a Corpsman medic watching an Etlan doctor draining a pleural cavity of its empyema, his expression showing how dearly he would have liked to roll up his dark green sleeves and wade in himself.