n.
Pronunciation: r ē - ' ā -j ə n, -g ə n
Function: noun
Etymology: International Scientific Vocabulary, from reagent
Date: circa 1911
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 \ ˌ r ē - ə - ' ji-nik, - ' gi- \ adjective