Wordnet 3.0
NOUN (1)
1.
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;
WordNet (r) 3.0 (2006):
reagin
n 1: 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