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Noun: mediastinum (mediastina)  ,mee-dee-u'stI-num
  1. The part of the thoracic cavity between the lungs that contains the heart and aorta and oesophagus and trachea and thymus

Derived forms: mediastina

Type of: bodily cavity, cavity, cavum

Part of: chest cavity, thoracic cavity

Encyclopedia: Mediastinum