- 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.
Origin of mediastinum
1535–45; < New 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for mediastinal
There was a mediastinal wound in connection with the bullet hole in the throat.Jimmy Breslin on JFK’s Assassination: Two Classic Columns
November 22, 2013
Area mediastinal, scapularis and ulnaris: the areas in front of the mediastinal, the scapular, and the ulnar veins in Orthoptera.
The laryngoscope may also reveal the presence of an aortic aneurism or a mediastinal tumour.Garcia the Centenarian And His Times
M. Sterling Mackinlay
Mediastinal: relating to the longitudinal median line or area.
- a membrane between two parts of an organ or cavity such as the pleural tissue between the two lungs
- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- A septum between two parts of an organ or a cavity.
- The region in mammals between the pleural sacs, containing the heart and all of the thoracic viscera except the lungs.interpleural space mediastinal space
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.