[ an-uh-fuh-lak-sis ]
/ ˌæn ə fəˈlæk sɪs /

noun Pathology.

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

Nearby words

  1. anaphylactogenesis,
  2. anaphylactoid,
  3. anaphylactoid purpura,
  4. anaphylactoid shock,
  5. anaphylatoxin,
  6. anaplasia,
  7. anaplasmosis,
  8. anaplastic,
  9. anaplastic cell,
  10. anaplasty

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for anaphylactic

British Dictionary definitions for anaphylactic


/ (ˌænəfɪˈlæksɪs) /


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

Word Origin for anaphylaxis

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 anaphylactic
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for anaphylactic


[ ăn′ə-fə-lăksĭs ]

n. pl. an•a•phy•lax•es (-lăksēz)

Hypersensitivity induced by preliminary exposure to a substance and usually producing a contraction of smooth muscle and a dilation of blood vessels.
anaphylactic shock
Related formsan′a•phy•lactic (-lăktĭk) adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for anaphylactic


[ ăn′ə-fə-lăksĭs ]

See anaphylactic shock.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.