noun Pathology.
exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.

1905–10; ana- + (pro)phylaxis

anaphylactic [an-uh-fuh-lak-tik] , adjective
anaphylactically, adverb
antianaphylactic, adjective, noun
pseudoanaphylactic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anaphylaxis (ˌænəfɪˈlæksɪs)
extreme sensitivity to an injected antigen, esp a protein, following a previous injection
[C20: from ana- + (pro)phylaxis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

anaphylaxis an·a·phy·lax·is (ān'ə-fə-lāk'sĭs)
n. pl. an·a·phy·lax·es (-lāk'sēz)

  1. Hypersensitivity induced by preliminary exposure to a substance and usually producing a contraction of smooth muscle and a dilation of blood vessels.

  2. See anaphylactic shock.

an'a·phy·lac'tic (-lāk'tĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
anaphylaxis   (ān'ə-fə-lāk'sĭs)  Pronunciation Key 
See anaphylactic shock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Anaphylaxis is a sudden and severe allergic reaction that occurs within minutes of exposure.
Anaphylaxis is a severe, whole-body allergic reaction that is life threatening.
The diagnosis and management of anaphylaxis: an updated practice parameter.
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