peroxidase(n = noun.substance) - any of a group of enzymes (occurring especially in plant cells) that catalyze the oxidation of a compound by a peroxide;
is a kind of oxidase
has particulars: glutathione peroxidase, horseradish peroxidase
peroxidase, n. Biochem. any of a class of enzymes found esp. in plants, which catalyze the oxidation of a substrate by hydrogen peroxide.