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English definition of “emphysema”

emphysema

noun [U] uk   /ˌem.fəˈsiː.mə/ us  
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.
(Definition of emphysema from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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