Dictionary

mediastinum

noun me·di·as·ti·num \ˌmē-dē-ə-ˈstī-nəm\
plural me·di·as·ti·na\-nə\

Definition of MEDIASTINUM

:  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
me·di·as·ti·nal \-ˈstī-nəl\ adjective

Origin of MEDIASTINUM

New Latin, from Medieval Latin, neuter of mediastinus medial, from Latin medius
First Known Use: 1541

mediastinum

noun me·di·as·ti·num \ˌmēd-ē-ə-ˈstī-nəm\   (Medical Dictionary)
plural me·di·as·ti·na \-nə\

Medical Definition of MEDIASTINUM

1
:  the space in the chest between the pleural sacs of the lungs that contains all the viscera of the chest except the lungs and pleurae; also :  this space with its contents

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