\Zy*mot"ic\, a. [Gr. ? causing to ferment, fr. ? to
ferment, ? ferment, leaven.]
1. Of, pertaining to, or caused by, fermentation.
2. (Med.) Designating, or pertaining to, a certain class of
   diseases. See {Zymotic disease}, below.
{Zymotic disease} (Med.), any epidemic, endemic, contagious,
   or sporadic affection which is produced by some morbific
   principle or organism acting on the system like a ferment.