re·a·gin 
(rē-ājĭn)
(rē-ājĭn)n.
1. An antibody found in the blood of individuals having a genetic predisposition to allergies.
2. A substance present in the blood of individuals having a positive serological test for syphilis.
[REAG(ENT) + -IN.]
re′a·ginic (rē′ə-jĭnĭk) adj.
re′a·gini·cal·ly adv.
- First Nation
- First Nations
- first night
- first off
- first offender
- first off/thing
- first person
- first-person
- first quantum number
- first quarter moon
- first-rate
- first responder
- first run
- first-run
- first sergeant
- first strike
- first-strike
- first string
- first-string
- first thing
- first thing
- first-timer
- first water
- First World
- First-World