idioisoagglutinin

[ĭd′ē-ō-ī′sō-ə-glōōtn-ĭn]
n.
  1. An idioagglutinin occurring in the blood of an animal and capable of agglutinating cells from an animal of the same species.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.