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internal thoracic vein

n.
  1. Either of usually two veins that accompany each internal thoracic artery, fusing together at the upper part of the chest and emptying into the brachiocephalic 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.