Etymology
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enzyme (n.)

1881, as a biochemical term, from German Enzym, coined 1878 by German physiologist Wilhelm Kühne (1837-1900), from Modern Greek enzymos "leavened," from en "in" (see en- (2)) + zymē "leaven" (see zymurgy). Related: Enzymotic.

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Definitions of enzyme

enzyme (n.)
any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions;
From wordnet.princeton.edu