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Webster 1913 Edition

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Noun.

[NL., fr. Gr. [GREEK], from [GREEK] to suppurate; [GREEK] in + [GREEK] pus.]

(Med.)

A collection of blood, pus, or other fluid, in some cavity of the body, especially that of the pleura.

Dunglison.

☞ The term empyema is now restricted to a collection of pus in the cavity of the pleura.

empyema ‎(plural empyemas or empyemata)

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

collection of pus