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[ree-ey-jin, -gin] /riˈeɪ dʒɪn, -gɪn/
noun, Immunology.
Also called Wassermann antibody. an antibody formed in response to syphilis and reactive with cardiolipin in various blood tests for the disease.
an antibody found in certain human allergies, as hay fever and asthma.
Origin of reagin
1910-15; < German Reagin, equivalent to reag(ieren) to react + -in -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for reagin


(immunol) a type of antibody that is formed against an allergen and is attached to the cells of a tissue. The antigen–antibody reaction that occurs on subsequent contact with the allergen causes tissue damage, leading to the release of histamine and other substances responsible for an allergic reaction
Word Origin
C20: from German reagieren to react + -in
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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reagin in Medicine

reagin re·a·gin (rē-ā'jĭn)

  1. An antibody found in the blood of individuals having a genetic predisposition to allergies such as asthma and hay fever.

  2. A substance present in the blood of individuals having a positive serological test for syphilis.

re'a·gin'ic (rē'ə-jĭn'ĭk) 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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