Source : Webster's Revised Unabridged Dictionary (1913)

Zymase \Zym"ase\, n. [From {Zyme}.] (Physiol. Chem.)
   A soluble ferment, or enzyme. See {Enzyme}.

Source : WordNet®

zymase
     n : a complex of enzymes that cause glycolysis; originally found
         in yeast but also present in higher organisms