mediastinum

Definition of Mediastinum in English :

1. mediastinum

the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus

WordNet Lexical Database for English. Princeton University. 2010.

Mediastinum

noun plural -na (-nə) anatomy

1.

a membrane between two parts of an organ or cavity such as the pleural tissue between the two lungs

2.

the part of the thoracic cavity that lies between the lungs, containing the heart, trachea, etc

nounWord forms: plural ˌmediasˈtina (ˌmidiæsˈtaɪnə ; mēˌdēastīˈnə)

1.

a membranous partition between two cavities of the body, esp. that separating the lungs or the two pleural sacs

2.

the space between the pleural sacs, containing the heart and other chest viscera except the lungs

n. pl. me·di·as·ti·na (-nə)

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