isoagglutinogen

[ī′sō-ăg′lōō-tĭnə-jən]
n.
  1. An isoantigen that on exposure to its corresponding isoantibody causes agglutination of the red blood cells to which it is attached.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.