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[an-uh-fuh-lak-sis] /ˌæn ə fəˈlæk sɪs/
noun, Pathology
exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.
Origin of anaphylaxis
1905-10; ana- + (pro)phylaxis
Related forms
[an-uh-fuh-lak-tik] /ˌæn ə fəˈlæk tɪk/ (Show IPA),
anaphylactically, adverb
antianaphylactic, adjective, noun
pseudoanaphylactic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for anaphylactic
  • And you don't know when you're going to have that one reaction and go into anaphylactic shock and maybe drop dead.
  • These reactions can range from mild skin rashes to rare but severe, even life-threatening, anaphylactic shock.
  • These reactions can range from mild skin rashes to rare, but severe and even life-threatening anaphylactic shock.
  • These reactions can range from mild skin rashes to rare but severe, even life-threatening anaphylactic shock.
  • Decreased blood pressure, wheezing, and other signs may indicate an anaphylactic reaction.
British Dictionary definitions for anaphylactic


extreme sensitivity to an injected antigen, esp a protein, following a previous injection
Derived Forms
anaphylactic, anaphylactoid, adjective
anaphylactically, adverb
Word Origin
C20: from ana- + (pro)phylaxis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for anaphylactic

1905, with -ic + medical Latin noun anaphylaxis "exaggerated susceptibility," from French anaphylaxie (1902), from Greek ana- (see ana-) + phylaxis "watching, guarding" (cf. prophylactic). Anaphylactic shock is attested by 1916.


Online Etymology Dictionary, © 2010 Douglas Harper
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anaphylactic in Medicine

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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anaphylactic in Science
See anaphylactic shock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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