empyema Meaning, Definition & Usage

  1. noun a collection of pus in a body cavity (especially in the lung cavity)

WordNet

Em`py*e"ma noun
Etymology
NL., fr. Gr. , from to suppurate; in + pus.
Definitions
  1. (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