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.
⇒ The term empyema is now restricted to a collection of pus in the cavity of the pleura.
© Webster 1913.