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radiophylaxis

(rā′dē-ō-fə-lăksĭs)
n.
  1. The lessened effect of a dose of radiation when administered after a previous smaller dose.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.