reagin

re·agin

noun \rē-ˈā-jən, -gən\

Definition of REAGIN

1

: a substance in the blood of persons with syphilis responsible for positive serological reactions for syphilis

2

: an antibody (as IgE in humans) that mediates hypersensitive allergic reactions of rapid onset

— re·agin·ic \ˌrē-ə-ˈji-nik, -ˈgi-\ adjective

Origin of REAGIN

International Scientific Vocabulary, from reagent

First Known Use: circa 1911

Rhymes with REAGIN

contagion, Pelagian