enzyme [ en-zahym ] SHOW IPA / ˈɛn zaɪm / PHONETIC RESPELLING 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. RELATED WORDS impetus
seethe Nearby words enzed
enzyme-inhibition theory of narcosis
enzyme-linked immunosorbent assay
enzymopathy Origin of enzyme 1880–85;
Medieval Greek énzymos
Greek en- en- 2
) leaven +
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for enzyme
The answer lies in polyphenol oxidase, an
enzyme that combines with oxygen to speed up cellular decomposition.
The final test for an
enzyme is the chemical change it brings about in the specific substance acted on.
From them Schaudinn decided that the poisonous action of the mosquito bite is caused by an
enzyme from a commensal fungus.
enzyme of saliva converts starch not into glucose but into a more complex sugar to which is given the name of maltose.
Here a similar action is caused by an
enzyme called ptyalin.
The filtrate was invariably found to be quite devoid of fermenting power, none of the
enzyme passing through the gelatin. British Dictionary definitions for enzyme 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
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Medicine definitions for enzyme n. Any of numerous proteins or conjugated proteins produced by living organisms and functioning as specialized catalysts for biochemical reactions. Related forms en′zy•mat ( ′ic -zə-măt) null ′ĭk 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 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
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.