idioheteroagglutinin

[ĭd′ē-ō-hĕt′ə-rō-ə-glōōtn-ĭn]
n.
  1. An idioagglutinin occurring in the blood of one animal, but capable of combining with the antigenic material from an animal of another species.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.