noun, Chemistry.
a compound containing the univalent ion O 2 − .
peroxide (def 1a, b).
any of certain metal oxides that contain the O2– ion: potassium superoxide, KO2

superoxide su·per·ox·ide (sōō’pər-ŏk’sīd’)
A compound containing a univalent anionic oxygen molecule or the univalent anion itself.


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