small cardiac vein

n.
  1. An inconstant vessel that accompanies the right coronary artery in the coronary sulcus from the right ventricle and empties into the coronary sinus or the middle cardiac vein.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.