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the complex of enzymes obtained from yeast, also occurring in bacteria and other organisms, that acts in alcoholic fermentation and other forms of glycolysis.
Historical Examples

Hans von Euler-Chelpin isolated one part of zymase, which remains active even after heating its solution to the boiling point.
Smithsonian Institution – United States National Museum – Bulletin 240 Anonymous

A comparison of the conditions of action of carboxylase and zymase has revealed several interesting points of difference.
Alcoholic Fermentation Arthur Harden

Although the action of zymase may be regarded as mechanical, the enzyme cannot be produced by any other than living protoplasm.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 3 Various

Such material is far more active than the zymase obtained originally by Buchner from the expressed juice of yeast-cells.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various

zymase is the active alcoholic fermentation enzyme of yeasts.
The Chemistry of Plant Life Roscoe Wilfred Thatcher

Those which produce carbon dioxide without the use of free “deamidizing” oxygen, such as zymase of yeast.
Dietetics for Nurses Fairfax T. Proudfit

Thus the yeast plant is supposed to bring about alcoholic fermentation by secreting the enzyme known as zymase.
An Elementary Study of Chemistry William McPherson

The best known example of a coenzyme in plant tissues is in connection with the activity of the zymase of yeast cells.
The Chemistry of Plant Life Roscoe Wilfred Thatcher

For the alcoholic fermentation of glucose by the zymase of yeast juice two substances are also necessary.
The Nature of Animal Light E. Newton Harvey

noun
a mixture of enzymes that is obtained as an extract from yeast and causes fermentation in sugars

zymase zy·mase (zī’mās’, -māz’)
n.
The enzyme complex in yeasts that catalyzes the breakdown of sugar into alcohol and carbon dioxide.