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
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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
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.