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catalase cat·a·lase (kāt'l-ās', -āz')
An enzyme found in most living cells that catalyzes the decomposition of hydrogen peroxide to water and oxygen.
an enzyme that brings about (catalyzes) the reaction by which hydrogen peroxide is decomposed to water and oxygen. Found extensively in mammalian tissues, catalase prevents the accumulation of and protects the body tissues from damage by peroxide, which is continuously produced by numerous metabolic reactions.