Meaning of “pulmonary atresia” in the English Dictionary

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"pulmonary atresia" in British English

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pulmonary atresianoun [ U ]

uk /ˌpʊl.mə.nər.i əˈtriː.ʃə/ us /ˈpʊl.məˌner.i əˈtriː.ʃə/ specialized

a congenital disorder in which the pulmonary valve (= a valve in the heart) closes so that blood does not flow from the heart to the lungs

(Definition of “pulmonary atresia” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)