名詞 reagin:

1. an immunoglobulin E that is formed as an antibody against allergens (such as pollen); attaches to cell membranes causing the release of histamine and other substances responsible for the local inflammation characteristic of an allergy

re.a.gin

n.（名詞）
An antibody found in the blood of individuals having a genetic predisposition to allergies such as asthma and hay fever.
反應素：個體血液中的一種抗體，可以對諸如氣喘病和光粉熱這些變態(tài)反應產(chǎn)生預先的基因處理
A substance present in the blood of individuals having a positive serological test for syphilis.
梅毒反應毒：個體血液中的一種物質(zhì)，可對梅毒產(chǎn)生向性血清反應

來源：
reag(ent)
reag(ent)
-in
-in

【引伸】
re.agin.ic
re.agin.ically
adv.（副詞）