Standard Lemma guide

superoxide

noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • US: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: S UW2 P ER0 AA1 K S AY2 D Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

A peroxide

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The univalent anion, O2−, obtained from molecular oxygen by adding an electron; any compound containing this anion

Definition source: English Wiktionary via Wiktextract

Topics: chemistry, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

the univalent anion O2-

Definition source: Princeton WordNet 3.0

Examples

  • much of the O2 supporting cellular respiration is reduced to the superoxide anion O2-

Meaning relationships

Synonyms: superoxide anion

Antonyms: none provided

Broader terms: anion

4

noun

Meaning 4

a metallic oxide containing the univalent anion O2-

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: oxide

History

Etymology

Etymology tree Proto-Indo-European *úp Proto-Indo-European *-er Proto-Indo-European *upér Proto-Italic *super Latin super Latin super-lbor. English super- Proto-Indo-European *h2eḱ-der.? Ancient Greek ὀξύς (oxús) Proto-Indo-European *ǵenh1- Proto-Indo-European *-os Proto-Indo-European *ǵénh1os Proto-Hellenic *génos Ancient Greek γένος (génos) French oxygène Latin acidusbor. French acide blend French oxidebor. English oxide English superoxide From super- + oxide.

Across languages

Translations

3 source translations are retained for this English entry.

  • Finnish: superoksidi — univalent anion
  • Italian: superossido — univalent anion
  • Spanish: superóxido — univalent anion