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English definition of “mitral valve”

mitral valve

noun [C usually sing] uk   /ˈmaɪ.trəlˌvælv/ specialized us  
the valve (= structure that opens and closes) in the heart that stops blood from returning into the left atrium (= upper space) from the left ventricle (= lower space) The circulatory system and blood
(Definition of mitral valve from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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