- That oxide of any series that contains the greatest number of oxygen atoms; applied most correctly to compounds containing an –O–O– link, as in hydrogen peroxide (H–O–O–H); a hydroperoxide is R–O–O–H.
- The O22− ion.
- Any member of a class of metallic oxides that contain the peroxide ion.
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Examples: glitazone, GI cocktail, etc.