Definition of pneumonia noun from the Oxford Advanced Learner's Dictionary

 

pneumonia

 noun
noun
BrE BrE//njuːˈməʊniə//
 
; NAmE NAmE//nuːˈmoʊniə//
 
[uncountable]
 
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a serious illness affecting one or both lungs that makes breathing difficult She died from bronchial pneumonia. Word Origin early 17th cent.: via Latin from Greek, from pneumōn ‘lung’.
See the Oxford Advanced American Dictionary entry: pneumonia