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1. An antibody found in the blood of individuals having a genetic predisposition to allergies.
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
relating to or caused by a reagin, or functioning as a reagin
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014