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English definition of “enzyme”

enzyme

noun [C]     /ˈen.zaɪm/
any of a group of chemical substances that are produced by living cells and cause particular chemical reactions to happen while not being changed themselves: An enzyme in the saliva of the mouth starts the process of breaking down the food .Animal biochemistryPlant biochemistry
(Definition of enzyme noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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