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radioactive iodine in Medicine

radioactive iodine

n.
  1. Any of the radioisotopes of iodine, especially I131, I125, or I123, used as tracers in biology and medicine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.