mediastinum

/ˈmidiəˌstaɪnəm/
IPA guide

Definitions of mediastinum
  1. noun
    the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
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    type of:
    bodily cavity, cavity, cavum
    (anatomy) a natural hollow or sinus within the body
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