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vitelline vessel

n.
  1. The artery that carries blood to the yolk sac from the embryo.
  2. The vein that carries blood from the yolk sac to the embryo.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.