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

Examples of enzyme in a Sentence

Recent Examples on the Web

Contrary to popular belief, the digestive enzyme pepsin has never been part of Pepsi’s formula. — Britannica Editors, Encyclopedia Britannica, 21 Aug. 2026

Another quandary concerns how LUCA could have manufactured proteins as complicated as enzymes, which are made from many amino acids linked together in a particular sequence. — Philip Ball, Scientific American, 20 Aug. 2026

How to fade the spots The most effective ingredients for fading these marks are tyrosinase inhibitors, which work by blocking the enzyme your skin uses to produce melanin. — Leslie Baumann, Miami Herald, 20 Aug. 2026

Azelaic acid helps reduce inflammation by targeting several inflammatory pathways in the skin, while helping fade pigmentation by inhibiting the pigment-forming enzyme tyrosinase. — Kelsey Stewart, Allure, 18 Aug. 2026

Word History

Etymology

German Enzym, from Middle Greek enzymos leavened, from Greek en- + zymē leaven — more at juice

First Known Use

1881, in the meaning defined above

Phrases Containing enzyme

• angiotensin converting enzyme
• enzyme-linked immunosorbent assay
• restriction enzyme

Rhymes for enzyme

• airtime
• bedtime
• daytime
• downtime
• halftime
• lifetime
• longtime
• lunchtime
• mealtime
• meantime
• nighttime
• noontime

Kids 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

ˌen-zə-ˈmat-ik

adjective

enzymatically

-ˈmat-i-k(ə-)lē

adverb

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