• synonyms


[kat-l-eys, -eyz]
noun Biochemistry.
  1. an enzyme that decomposes hydrogen peroxide into oxygen and water.
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Origin of catalase

First recorded in 1900–05; catal(ysis) + -ase
Related formscat·a·lat·ic [kat-l-at-ik] /ˌkæt lˈæt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for catalase

Historical Examples

  • Catalase decomposes peroxides, with the liberation of free oxygen.

    The Chemistry of Plant Life

    Roscoe Wilfred Thatcher

  • A very widely distributed reducing enzyme is catalase which decomposes hydrogen peroxide.

    The Fundamentals of Bacteriology

    Charles Bradfield Morrey

  • The work of Burge and his co-workers on the catalase content of tissue led to a similar conclusion.

    Scurvy Past and Present

    Alfred Fabian Hess

  • He has demonstrated that the tissues of polyneuritic birds show a decrease in catalase activity to a point 56 per cent.

    Scurvy Past and Present

    Alfred Fabian Hess

  • The rate of utilization was generally higher during the test period in the presence of catalase than without added catalase.

British Dictionary definitions for catalase


  1. an enzyme that catalyses the decomposition of hydrogen peroxide
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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

catalase in Medicine


(kătl-ās′, -āz′)
  1. An enzyme found in most living cells that catalyzes the decomposition of hydrogen peroxide to water and oxygen.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.