heteroantiserum

[ hĕt′ə-rō-ăntĭ-sîr′əm ]

n.

An antiserum developed in one animal species against antigens or cells of another species.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.