umbilical artery

n.
  1. Either of two arteries that before birth is a continuation of the common iliac artery and after birth partly forms the medial umbilical ligament and partly is reduced in size and gives off the superior vesical artery.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.