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hemiazygos vein

(hĕm′ē-ăzĭ-gŏs′, -ā-zīgŏs′)
n.
  1. A continuation of the left ascending lumbar vein, ascending along the left side of the lower thoracic vertebrae to the eighth vertebra, where it crosses the midline behind the aorta, thoracic duct, and esophagus, and empties into the azygos vein.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.