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aphylaxis

(ā′fə-lăk′sĭs, ăf′ə-)
n.
  1. Lack of protection against disease.nonimmunity
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Related formsa′phy•lac′tic (-lăk′tĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.