reagin

noun re·agin \rē-ˈā-jən, -gən\

Definition of REAGIN

: 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

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

International Scientific Vocabulary, from reagent

First Known Use: circa 1911

Medical Dictionary

noun re·agin \rē-ˈā-jən, -gən\

: a substance that is in the blood of individuals with syphilis and is responsible for positive serological reactions for syphilis

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

—re·agin·ic \ˌrē-ə-ˈjin-ik, -ˈgin-\ adjective

Next Word in the Dictionary: reaksPrevious Word in the Dictionary: reaggregateAll Words Near: reagin

What made you want to look up reagin? Please tell us where you read or heard it (including the quote, if possible).

Put-downs with flair

How to use a word that (literally) drives some people nuts.

Test your vocab with our fun, fast game

Ailurophobia, and 9 other unusual fears