em·py·e·ma 
(ĕm′pī-ēmə)
(ĕm′pī-ēmə)n. pl. em·py·e·ma·ta (-mə-tə)
The presence of pus in a body cavity, especially the pleural cavity.
[Medieval Latin empyēma, from Greek empuēma, from empuein, to suppurate; see p- in the Appendix of Indo-European roots.]
em′py·emic adj.
- butterfly
- butterfly bush
- butterfly chair
- butterfly effect
- butterflyfish
- butterfly orchid
- butterfly pea
- butterfly valve
- butterfly weed
- butteriness
- buttermilk
- buttermilk sky
- butternut
- butternut squash
- butterscotch
- butter up
- butterweed
- butterwort
- buttery
- buttery
- butthead
- butt hinge
- butthole
- butt in
- buttinski