obturator vein

n.
  1. A vein that is formed by a union of tributaries draining the hip joint and the muscles of the upper and back part of the thigh, enters the pelvis by the obturator canal, and empties into the internal iliac vein.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.