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From The Collaborative International Dictionary of English v.0.48:
Zymotic \Zy*mot"ic\, a. [Gr. ? causing to ferment, fr. ? to ferment, ? ferment, leaven.] [1913 Webster] 1. Of, pertaining to, or caused by, fermentation. [1913 Webster] 2. (Med.) Designating, or pertaining to, a certain class of diseases. See Zymotic disease, below. [1913 Webster] 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. [1913 Webster]