: any of numerous complex proteins that are produced by living cells and catalyze specific biochemical reactions at body temperatures
Examples of enzyme in a Sentence
Recent Examples on the Web
Use an enzyme cleaner inside the drain.
—
Arricca Elin Sansone, Southern Living, 16 Nov. 2025
Next, Platts-Mills sent some of the blood to the Mayo Clinic lab, which tested it for an enzyme called tryptase that’s made by immune cells called mast cells.
—Brenda Goodman, CNN Money, 14 Nov. 2025
Human cells – like all animal cells – use enzymes to lower activation energy in reactions and thus increase reaction rates.
—New Atlas, 14 Nov. 2025
Extracting it is extremely difficult because the molecule is chemically unstable and rapidly destroyed by enzymes and environmental changes after death.
—Humberto Basilio, Scientific American, 14 Nov. 2025
See All Example Sentences for enzyme
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Arricca Elin Sansone, Southern Living, 16 Nov. 2025
Next, Platts-Mills sent some of the blood to the Mayo Clinic lab, which tested it for an enzyme called tryptase that’s made by immune cells called mast cells.
—Brenda Goodman, CNN Money, 14 Nov. 2025
Human cells – like all animal cells – use enzymes to lower activation energy in reactions and thus increase reaction rates.
—New Atlas, 14 Nov. 2025
Extracting it is extremely difficult because the molecule is chemically unstable and rapidly destroyed by enzymes and environmental changes after death.
—Humberto Basilio, Scientific American, 14 Nov. 2025
See All Example Sentences for enzyme
Cite this Entry
“Enzyme.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/enzyme. Accessed 20 Nov. 2025.
Copy CitationKids Definition
enzyme
noun
en·zyme
ˈen-ˌzīm 
: any of various complex proteins produced by living cells that bring about or speed up reactions (as in the digestion of food) without being permanently altered
enzymatic
adjective
ˌen-zə-ˈmat-ik
enzymatically
adverb
-ˈmat-i-k(ə-)lē
Medical Definition
enzyme
noun
en·zyme
ˈen-ˌzīm
: any of numerous complex proteins that are produced by living cells and catalyze specific biochemical reactions at body temperatures
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