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inferior mesenteric vein

n.
  1. A vein that is the continuation of the superior rectal vein at the brim of the pelvis, ascends to the left of the aorta behind the peritoneum, and empties into the splenic vein or into the superior mesenteric 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.