per·ox·ide 
(pə-rŏksīd′)
(pə-rŏksīd′)n.
1. The divalent O2 group, or a compound containing this group, such as sodium peroxide, Na2O2, used as an oxidizing agent or bleach.
2. Hydrogen peroxide.
tr.v. per·ox·id·ed, per·ox·id·ing, per·ox·ides
1. To treat with peroxide.
2. To bleach (hair) with hydrogen peroxide.
per·oxide′ adj.
per′ox·idic (pûr′ŏk-sĭdĭk) adj.