empyema

noun Pathology.

1. a collection of pus in a body cavity, especially the pleural cavity.

noun plural -emata (-ˈiːmətə) or -emas

1. a collection of pus in a body cavity, esp in the chest

n. pl. em•py•e•ma•ta (-mə-tə)

1. The presence of pus in a body cavity, especially the pleural cavity.