Ĕm'py-ē'mă, n.

n. [Gr. ἐμπύημα, from ἐμπυεῖν, to have abscesses, from ἐμ, for ἐν, in, and πυεῖν, to separate, from πύον, pus.] (Med.) A collection of blood, pus, or other fluid, in some cavity of the body, especially that of the pleura. Dunglison.