isolysin

[ī-sŏlĭ-sĭn, ī′sə-līsĭn]
n.
  1. An antibody that combines with, sensitizes, and causes complement-fixation and the dissolution of the cells that contain the specific isoantigen.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.