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Definition of: pneumonia
(n·mōn′yə, ny-) noun Pathol.
An infectious disease characterized by inflammation of the lung tissue. The two principal types are bronchopneumonia, involving the bronchi and parenchyma of the lungs; and lobar or croupous pneumonia, affecting one or more lobes of the lungs. [<NL <Gk. pneumonia <pneumōn lung <pneein breathe]
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