mediastinum
noun
me·di·as·ti·num
ˌmē-dē-ə-ˈstī-nəm
plural mediastina
ˌmē-dē-ə-ˈstī-nə
: the space in the chest between the pleural sacs of the lungs that contains all the tissues and organs of the chest except the lungs and pleurae
also
: this space with its contents
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Merriam-Webster unabridged
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