pneu·mo·nia 
(n-mōnyə, ny-)
(n-mōnyə, ny-)n.
An acute or chronic disease marked by inflammation of the lungs, usually caused by a bacterium, virus, or other infectious agent.
[New Latin, from Greek pneumoniā, lung disease, alteration (influenced by pneuma, breath) of pleumoniā, from pleumōn, lung; see pleu- in the Appendix of Indo-European roots.]