mediastinum

/ˌmiːdi.əˈstaɪnəm/

miːdi · ƏSTAꞮNƏM (2 syllables)

English Noun

Definition

The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.

Etymology

From New Latin mediastīnum, from Medieval Latin mediastīnus (“middling; middle”), from Latin mediastīnus (“a common servant”).