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azygos vein in Medicine

azygos vein

n.
  1. A vein that arises from the right ascending lumbar vein or the inferior vena cava, ascends through the aortic orifice of the diaphragm, lies in the posterior mediastinum, and terminates in the superior vena cava.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.