noun, plural mediastina [mee-dee-a-stahy-nuh] . Anatomy.
a median septum or partition between two parts of an organ, or paired cavities of the body.
the partition separating the right and left thoracic cavities, formed of the two inner pleural walls, and, in humans, comprising all the viscera of the thorax except the lungs.

1535–45; < Neo-Latin; compare mediastīnus of middle class, apparently identical with Latin mediast(r)īnus a low-ranking slave, perhaps derivative of medius mid1, though sense and formation unclear

mediastinal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mediastinum (ˌmiːdɪəˈstaɪnəm)
n , pl -na
1.  a membrane between two parts of an organ or cavity such as the pleural tissue between the two lungs
2.  the part of the thoracic cavity that lies between the lungs, containing the heart, trachea, etc
[C16: from medical Latin, neuter of Medieval Latin mediastīnus median, from Latin: low grade of servant, from medius mean]

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American Heritage
Medical Dictionary

mediastinum me·di·as·ti·num (mē'dē-ə-stī'nəm)
n. pl. me·di·as·ti·na (-nə)

  1. A septum between two parts of an organ or a cavity.

  2. The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs. Also called interpleural space, mediastinal space.

me'di·as·ti'nal (-nəl) adj.
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