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pneumonia (n.)

c. 1600, from Modern Latin, from Greek pneumonia "inflammation of the lungs," from pneumon "lung," altered (probably by influence of pnein "to breathe") from pleumon "lung," literally "floater," probably cognate with Latin pulmo "lung(s)," from PIE root *pleu- "to flow."

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Definitions of pneumonia from WordNet

pneumonia (n.)
respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants;
From wordnet.princeton.edu