companion vein

companion vein

n.
An accompanying vein.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Cerebral blood drains through emissary veins and their smaller companion veins into "collecting sinuses" just beneath the skull, he says.