mediastinum

Noun
  1. The part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus (synset 105332239)
    is a type of: bodily cavity, cavity, cavum - (anatomy) a natural hollow or sinus within the body
    is a part of: chest cavity, thoracic cavity - the cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heart

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