- a membranous partition between two cavities of the body, esp. that separating the lungs or the two pleural sacs
- the space between the pleural sacs, containing the heart and other chest viscera excluding the lungs
Origin of mediastinumModern Latin from Medieval Latin mediastinus, in the middle (form influenced, influence by Classical Latin mediastinus, servant, medical assistant) from Classical Latin medius, middle: see mid
The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.
Origin of mediastinumNew Latin mediastīnum from neuter of Medieval Latin mediastīnus medial, middle from Latin servant employed on general tasks ( Medieval Latin anatomical sense probably influenced by Latin intestīnum intestine ) from medius middle ; see medhyo- in Indo-European roots.