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Dictionary

  Definition of mediastinum
  1. the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
Part Meronyms: chest cavity, thoracic cavity

 

 
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ken means the range of vision; "out of sight of land"; range of what one can know or understand; "beyond my ken"; ... more
 
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