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English definition of “mediastinum”

mediastinum

noun uk   /ˌmiː.di.əˈstaɪn.əm/ us    /ˌmiː.di.əˈstaɪ.nəm/ specialized
[C] ( plural mediastina ) a structure that divides a body part in the centre: a mediastinal tumour
the area of the chest that contains the heart and other organs and tissues
(Definition of mediastinum from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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