Enzyme (noun)

1. A substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction.
2. A protein molecule that catalyzes a specific chemical reaction in the body.

Origin:

From german enzym, coined by german physiologist wilhelm kühne from greek enzymos ("in yeas.t")

Examples:

1. Lipases are enzymes that break down fats.
2. Enzymes play a crucial role in the metabolism of living organisms.
3. The enzyme amylase is secreted in the saliva and breaks down carbohydrates.
4. Enzyme supplements are sometimes used to help with digestion.
5. Enzymes are highly specific in the reactions they catalyze.