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
reagin in American English
(riˈeɪdʒɪn)
noun
a type of antibody in the blood associated with some allergic diseases