noun Etymology: International Scientific Vocabulary, from reagent Date: circa 1911 a substance in the blood of persons with syphilis responsible for positive serological reactions for syphilis, an antibody (as IgE in humans) that mediates hypersensitive allergic reactions of rapid onset, ~ic adjective
REAGIN
Meaning of REAGIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012