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emphysema

noun [U]
 
 
/ˌem.fəˈsiː.mə/

Definition

a condition in which the small bags in the lungs become filled with too much air, causing breathing difficulties and heart problems: Heavy cigarette smoking often causes emphysema.Respiratory disorders
(Definition of emphysema noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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