from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An antibody found in the blood of individuals having a genetic predisposition to allergies such as asthma and hay fever.
- n. A substance present in the blood of individuals having a positive serological test for syphilis.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the local inflammation characteristic of an allergy
reag(ent) + -in.(American Heritage® Dictionary of the English Language, Fourth Edition)