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zygote a cell formed by the union of two gametes or sex cells. [2 definitions]
zymase an enzyme found in yeast that decomposes sugar into alcohol and carbon dioxide.
zymo- fermentation. [2 definitions]
zymogen an inactive protein that has the potential to become an enzyme because of an internal change.
zymology the science involving the chemistry of fermentation; enzymology.
zymurgy the branch of chemistry that deals with the fermentation process, as in beer brewing or winemaking.