ozonizer|ˈəʊzəʊnaɪzə(r)| [f.prec. + -er1.] An apparatus for producing ozone. 1875Watts Dict.Chem. VII. 887 Houzeau has constructed an apparatus called an ‘ozoniser’, by which ozone is produced in considerable quantity.1893Times 18 July 2/6 Other forms of ozonizers are also employed.