The Collaborative International Dictionary of English v.0.48:
Zymase \Zym"ase\, n. [From Zyme.] (Physiol. Chem.) A soluble ferment, or enzyme. See Enzyme. [1913 Webster]WordNet (r) 3.0 (2006):
zymase n 1: a complex of enzymes that cause glycolysis; originally found in yeast but also present in higher organisms