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1. (n.) mediastinum
a median septum or partition between two parts of an organ or paired cavities of the body.
2. mediastinum
the area in the chest that lies between the lungs, is bounded by the sternum, the spinal column, and the diaphragm, and contains the heart, esophagus, trachea, and other thoracic structures.
Etymology: (1535–45; < NL < ML mediastīnus middle class, der. of L mediusmid1)
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| Definition of 'mediastinum' |
Princeton's WordNet |
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1. (noun) mediastinum
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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| Definition of 'mediastinum' |
Webster Dictionary |
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1. (noun) mediastinum
a partition; a septum; specifically, the folds of the pleura (and the space included between them) which divide the thorax into a right and left cavity. The space included between these folds of the pleura, called the mediastinal space, contains the heart and gives passage to the esophagus and great blood vessels
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Definitions of mediastinum 
