PEROXIDE

[specialized] hydrogen peroxide [noun] - a liquid chemical used to make hair very pale in colour or to kill bacteriaPeroxide is a bleach and an antiseptic. [U]Peroxides are found in household detergents. [C]She has dyed her brown hair peroxide blonde.(esp. disapproving) A peroxide blonde is a woman who has used peroxide to make her hair very pale yellow which looks unnatural.