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anaphylaxis

[an-uh-fuh-lak-sis]
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noun Pathology.
  1. exaggerated allergic reaction to a foreign protein resulting from previous exposure to it.

Origin of anaphylaxis

First recorded in 1905–10; ana- + (pro)phylaxis
Related formsan·a·phy·lac·tic [an-uh-fuh-lak-tik] /ˌæn ə fəˈlæk tɪk/, adjectivean·a·phy·lac·ti·cal·ly, adverban·ti·an·a·phy·lac·tic, adjective, nounpseu·do·an·a·phy·lac·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for anaphylaxis

anaphylaxis

noun
  1. extreme sensitivity to an injected antigen, esp a protein, following a previous injection
Derived Formsanaphylactic or anaphylactoid, adjectiveanaphylactically, 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

Word Origin and History for anaphylaxis

n.

see anaphylactic.

Online Etymology Dictionary, © 2010 Douglas Harper

anaphylaxis in Medicine

anaphylaxis

(ăn′ə-fə-lăksĭs)
n. pl. an•a•phy•lax•es (-lăksēz)
  1. Hypersensitivity induced by preliminary exposure to a substance and usually producing a contraction of smooth muscle and a dilation of blood vessels.
  2. anaphylactic shock
Related formsan′a•phy•lactic (-lăktĭk) adj.

anaphylaxis in Science

anaphylaxis

[ăn′ə-fə-lăksĭs]
  1. See anaphylactic shock.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.