from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An enzyme found in the blood and in most living cells that catalyzes the decomposition of hydrogen peroxide into water and oxygen.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An enzyme found in the liver that catalyses the decomposition of hydrogen peroxide to water and oxygen.

from the GNU version of the Collaborative International Dictionary of English

  • n. an enzyme found in most plant and animal cells that functions as an oxidative catalyst; it decomposes hydrogen peroxide into hydrogen and water.

from The Century Dictionary and Cyclopedia

  • n. An oxidation-ferment which decomposes hydrogen peroxid catalytically with the liberation of oxygen.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. enzyme found in most plant and animal cells that functions as an oxidative catalyst; decomposes hydrogen peroxide into oxygen and water


catal(ysis) + -ase.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • One reason for their discontent may be found in the results of another recent study, which named an enzyme called catalase as a primary culprit for causing graying hair.


  • Initially, hydrogen peroxide is produced in trace amounts because another enzyme called catalase (an enzyme that helps to break down hydrogen peroxide into harmless water and oxygen) is present.


  • CP12 acts as a specific chaperone, since it does not protect other proteins, such as catalase, alcohol dehydrogenase, or lysozyme.

    Journal of Biological Chemistry current issue

  • Normally, an enzyme called catalase breaks hydrogen peroxide into water and oxygen, but as the hair follicles aged, that enzyme decreased.

    The old gray hair, she ain’t what she used to be

  • The barley grass in Green Magma has been shown to contain a high level of antioxidants, including catalase and carotenoids, along with many other nutrients to help the body increase in overall antioxidant status, and therefore may be useful in supporting normal bone mass during menopause and beyond.

    Forever Young

  • Thus, catalase prevents ovariectomy-induced bone loss.

    Forever Young

  • Ovariectomized animals show increased bone resorption, which is prevented by the administration of either estrogen or catalase.

    Forever Young

  • Green Magma also contains the antioxidants alpha-carotene, beta-carotene, vitamin C, vitamin E succinate, superoxide dismutase SOD, catalase, and chlorophyll.

    Forever Young

  • High amounts of malic, citric, tartaric, oxalic and other organic acids combined with the enzymes catalase and peroxidase give honey its renowned antibacterial properties.

    Dr. Reese Halter: Giving Thanks for Bees

  • What it does is increase the production of two enzymes, SOD (superoxide dismutase) and CAT (catalase), which play a major role in neutralizing cell damage.

    Dr. M.J. Wegmann: Battling Breast Cancer: Turning Lemons Into Lemonade (An Interview)


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  • has an iron core to its structure, and iron is essential to its action.

    March 19, 2012