# superoxide

> English word · Noun · frequency rank #65,545

## Definitions
1. A peroxide
2. The univalent anion, O₂⁻, obtained from molecular oxygen by adding an electron; any compound containing this anion

## Etymology
From super- + oxide.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/superoxide