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mediastinum
me·di·as·ti·num [ mdee ə stnəm ] (plural me·di·as·ti·na [ mdee ə stnə ])


noun 
Definition:
 
region in chest: in mammals, the region of the chest between the lungs that contains the heart, trachea, and other organs
[15th century. < medieval Latin, form of mediastinus "medial" < Latin, "common servant" < medius "middle"]

me·di·as·ti·nal adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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