Definition of Enzyme

1. Noun. Any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions.

Definition of Enzyme

1. n. An unorganized or unformed ferment, in distinction from an organized or living ferment; a soluble, or chemical, ferment. Ptyalin, pepsin, diastase, and rennet are good examples of enzymes.

Definition of Enzyme

1. Noun. (biochemistry) A globular protein that catalyses a biological chemical reaction. ¹

¹ Source:

Definition of Enzyme

1. a complex protein [n -S] : ENZYMIC [adj]

Medical Definition of Enzyme

1. A protein molecule produced by living organisms that catalyses chemical reactions of other substances without itself being destroyed or altered upon completion of the reactions. Enzymes are classified according to the recommendations of the Nomenclature Committee of the International Union of Biochemistry. Each enzyme is assigned a recommended name and an Enzyme Commission (EC) number. They are divided into six main groups, oxidoreductases, transferases, hydrolases, lyases, isomerases and ligases. (09 Oct 1997)

Enzyme Pictures

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Lexicographical Neighbors of Enzyme

enzootic encephalomyelitis virus
enzootic haematuria
enzootic pneumonia
enzootic stability
enzygotic twins
enzymatic hydrolysis
enzymatic synthesis
enzyme (current term)
enzyme-catalyzed ligation
enzyme-substrate complex
enzyme activation
enzyme analog
enzyme antagonist
enzyme defect
enzyme derepression
enzyme electrode
enzyme immobilisation

Literary usage of Enzyme

Below you will find example usage of this term as found in modern and/or classical literature:

1. Principles of General Physiology by William Maddock Bayliss (1920)
"The exponential ratio of the concentration of the enzyme to its activity receives a satisfactory explanation on this adsorption theory, as will be plain ..."

2. The Journal of Heredity by American Genetic Association (1917)
"enzyme I is essential to the production of any color, but by itself only produces ... enzyme I-II is also more efficient than enzyme I in another way. ..."

3. Chemical Abstracts by American Chemical Society (1916)
"The action of the enzyme upon the substrate has a normal temp, coefficient. The same amt. of enzyme causes, at higher temps., ..."

4. The Journal of Experimental Medicine by Rockefeller University, Rockefeller Institute, Rockefeller Institute for Medical Research (1922)
"That leucocytes contain an enzyme or enzymes capable of splitting native proteins to simpler nitrogenous compounds is an accepted fact at the present time. ..."

5. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1912)
"enzyme, deviates considerably from what we should expect on the basis of the law of mass ... Such experiments show that the enzyme, instead of inverting a ..."

6. Proceedings of the Society for Experimental Biology and Medicine (1903)
"enzyme activities (Tables II and III) are expressed as activity per milligram pituitary tissue, activity per milligram protein, and activity per pituitary ..."

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