a type of organelle present in most eukaryotic cells that carry out oxidative reactions, such as oxidation of alcohol in the liver
peroxisome in American English
(pərˈɑksɪˌsoʊm)
US
noun
any of a group of organelles in some cells of mammals, the leaves of plants, etc.,containing enzymes that produce and then decompose hydrogen peroxide: thought to be involved in cellular metabolism