per·ox·i·dase pə-'räk-sə-.dās, -.dāz n an enzyme occurring esp. in plants, milk, and white blood cells and consisting of a protein complex with hematin groups that catalyzes the oxidation of various substances by peroxides

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an enzyme, found mainly in plants but also present in leucocytes and milk, that catalyses the dehydrogenation (oxidation) of various substances in the presence of hydrogen peroxide (which acts as a hydrogen acceptor, being converted to water in the process).

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per·ox·i·dase (pər-okґsĭ-dās) any of a group of enzymes of the oxidoreductase class that catalyze the oxidation of organic substrates by hydrogen peroxide, which is reduced to water [EC 1.11]. These enzymes are heme proteins, found frequently in plants and occasionally in animal tissues. [EC] a specific oxidoreductase that catalyzes the reaction of hydrogen peroxide and halide ions to produce cytotoxic acids (such as hypochlorous acid) and other intermediates; these play a role in oxygen-dependent killing of microorganisms and tumor cells. The enzyme is a hemoprotein found in the azurophil granules of neutrophils and the primary lysosomes of monocytes and it has the green color seen in pus. Deficiency of the enzyme, an autosomal recessive or acquired trait, is usually asymptomatic but may predispose affected individuals to severe fungal infections.

Medical dictionary. 2011.

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