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

 

emphysema

 noun
noun
BrE BrE//ˌemfɪˈsiːmə//
 
; NAmE NAmE//ˌemfɪˈsiːmə//
 
[uncountable](medical)
 
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a condition that affects the lungs, making it difficult to breathe Word Origin mid 17th cent. (originally referring to a condition where air is abnormally present in the body tissues): via late Latin from Greek emphusēma, from emphusan ‘puff up’.
See the Oxford Advanced American Dictionary entry: emphysema