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radioimmunodiffusion

(rā′dē-ō-ĭm′yə-nō-dĭ-fyōōzhən, -ĭ-myōō′-)
n.
  1. A method for the study of antigen-antibody reactions by gel diffusion using a radioisotope-labeled antigen or antibody.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.