
1) Bodily cavity 2) Cavity 3) Cavum
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https://www.crosswordclues.com/clue/mediastinum

The mediastinum is an undelineated group of structures in the thorax, surrounded by loose connective tissue. It is the central compartment of the thoracic cavity. It contains the heart, the great vessels of the heart, the esophagus, the trachea, the phrenic nerve, the cardiac nerve, the thoracic duct, the thymus, and the lymph nodes of the central...
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http://en.wikipedia.org/wiki/Mediastinum

• (n.) A partition; a septum; specifically, the folds of the pleura (and the space included between them) which divide the thorax into a right and left cavity. The space included between these folds of the pleura, called the mediastinal space, contains the heart and gives passage to the esophagus and great blood vessels.Mediastinum: words in t...
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http://thinkexist.com/dictionary/meaning/mediastinum/

the anatomic region located between the lungs that contains all the principal tissues and organs of the chest except the lungs. It extends from the ... [3 related articles]
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http://www.britannica.com/eb/a-z/m/62

The area between the lungs. The organs in this area include the heart and its large blood vessels, the trachea, the esophagus, the thymus, and lymph nodes but not the lungs.
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http://www.cancer.gov/dictionary?expand=M

The space between the mammalian lungs in their pleural cavities, including the structures in that space. The mediastinum is a narrow dorsoventrally extended cleft that extends from the sternum (breastbone) in front to the spinal column behind, and from the inlet of the thoracic duct (one of the main...
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http://www.daviddarling.info/encyclopedia/M/mediastinum.html

<anatomy> The space in the thoracic cavity behind the sternum and in between the two pleural sacs (containing the lungs). ... (27 Sep 1997) ...
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http://www.encyclo.co.uk/local/20973

(me″de-әs-ti´nәm) a median septum or partition. the mass of tissues and organs separating the sternum in front from the vertebral column behind, containing the heart and its large vessels, trachea, esophagus, thymus, lymph nodes, and other structures and tissues. It is divided into anteri...
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http://www.encyclo.co.uk/local/21001

The space in the centre of the chest (thoracic cavity) between the lungs. The main organ in the mediastinum is the heart. Also contains the thymus and some other lymph structures
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http://www.encyclo.co.uk/visitor-contributions.php

A space in the middle of the thorax
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http://www.generalandmedical.com/glossary/index_alpha_Results.html?mode=M

The area between the lungs. It contains the heart and pericardium, the bases of the great vessels, the trachea and bronchi, esophagus, thymus, lymph nodes, thoracic duct, phrenic and vagus nerves, and other structures and tissues.
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http://www.lgdalliance.org/research/glossary-of-medical-terms/

Type: Term Pronunciation: me′dē-as-tī′nŭm Definitions: 1. A septum between two parts of an organ or a cavity. 2. The median partition of the thoracic cavity, covered by the mediastinal part of the parietal pleura and containing all the thoracic viscera and structures except the lungs. It is divided arbitrarily into two ma...
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http://www.medilexicon.com/medicaldictionary.php?t=53384

Mediastinum: The area between the lungs. The organs in this area include the heart and its large veins and arteries, the trachea, the esophagus, the bronchi, and lymph nodes.
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http://www.medterms.com/script/main/art.asp?articlekey=4313

(me;de-ua-sti;num) The partition in the center of the thorax between the two pleural cavities.
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http://www.mhhe.com/biosci/abio/glossary.mhtml

[
n] - the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
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http://www.webdictionary.co.uk/definition.php?query=mediastinum

media, middle; stare, stand, i.e. midline partition.
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https://aclandanatomy.com/Glossary.aspx

Area at the centre of the chest which contains the heart, windpipe (trachea), gullet (oesophagus), large main blood vessels and the lymph nodes that surround the heart.
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https://www.encyclo.co.uk/local/20753
noun the part of the thoracic cavity between the lungs that contains the heart and aorta and esophagus and trachea and thymus
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https://www.encyclo.co.uk/local/20974

derivation doubtful, but possibly from Latin medius = middle, and stans = standing; hence, a median vertical partition, adjective - mediastinal.
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https://www.encyclo.co.uk/local/21450
No exact match found.