enzyme

[ en-zahym ]
/ ˈɛn zaɪm /

noun Biochemistry.

any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.
Compare -ase.

Origin of enzyme

1880–85; < Medieval Greek énzymos leavened (Greek en- en-2 + zȳ́m(ē) leaven + -os adj. suffix)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for enzyme

British Dictionary definitions for enzyme

enzyme

/ (ˈɛnzaɪm) /

noun

any of a group of complex proteins or conjugated proteins that are produced by living cells and act as catalysts in specific biochemical reactions

Derived Forms

enzymatic (ˌɛnzaɪˈmætɪk, -zɪ-) or enzymic (ɛnˈzaɪmɪk, -ˈzɪm-), adjective

Word Origin for enzyme

C19: from Medieval Greek enzumos leavened, from Greek en- ² + zumē leaven
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for enzyme

enzyme

[ ĕnzīm ]

n.

Any of numerous proteins or conjugated proteins produced by living organisms and functioning as specialized catalysts for biochemical reactions.

Related forms

en′zy•matic (-zə-mătĭk) null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for enzyme

enzyme

[ ĕnzīm ]

Any of numerous proteins produced in living cells that accelerate or catalyze the metabolic processes of an organism. Enzymes are usually very selective in the molecules that they act upon, called substrates, often reacting with only a single substrate. The substrate binds to the enzyme at a location called the active site just before the reaction catalyzed by the enzyme takes place. Enzymes can speed up chemical reactions by up to a millionfold, but only function within a narrow temperature and pH range, outside of which they can lose their structure and become denatured. Enzymes are involved in such processes as the breaking down of the large protein, starch, and fat molecules in food into smaller molecules during digestion, the joining together of nucleotides into strands of DNA, and the addition of a phosphate group to ADP to form ATP. The names of enzymes usually end in the suffix -ase.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for enzyme

enzyme

[ (en-zeyem) ]

A protein molecule that helps other organic molecules (see also organic molecule) enter into chemical reactions with one another but is itself unaffected by these reactions. In other words, enzymes act as catalysts for organic biochemical reactions.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.