mediastinum
/ˌmidiəˈstaɪnəm/
noun
- The central compartment of the chest cavity, located between the lungs, containing the heart, trachea, esophagus, thymus, and major blood vessels.
- The mediastinum houses the heart and the roots of the great vessels.
- The doctor explained that the tumor was located in the anterior mediastinum.
- An infection in the mediastinum can be life-threatening.