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OXFORD DICTIONARY

empyema

Noun

em=py=e=ma

WORDNET DICTIONARY

empyema(n = noun.state) Array - a collection of pus in a body cavity (especially in the lung cavity); Array

has particulars: purulent pleurisy

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

A collection of blood, pus, or other fluid, in some cavity of the body, especially that of the pleura. Dunglison. [1913 Webster]

" The term empyema is now restricted to a collection of pus in the cavity of the pleura." [1913 Webster]

empyema, n. a collection of pus in a cavity, esp. in the pleura.

Etymology

LL f. Gk empuema f. empueo suppurate (as EN-(2), puon pus)

For further exploring for "empyema" in Webster Dictionary Online