n.
Pronunciation: ˌ m ē -d ē - ə - ' st ī -n ə m
Function: noun
Inflected Form: plural -na \ -n ə \
Etymology: New Latin, from Medieval Latin, neuter of mediastinus medial, from Latin medius
Date: 1541
: 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 \ - ' st ī -n ə l \ adjective