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English definition of “mediastinum”

mediastinum

noun [C]     /ˌmiː.di.əˈstaɪn.əm/ US  /ˌmiː.di.əˈstɑɪ.nəm/ (plural mediastina) specialized
a structure that divides a body part in the centre : a mediastinal tumour Substances and structures in the body
(Definition of mediastinum noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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