superoxide: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “superoxide” mean?
A chemical compound containing the highly reactive O₂⁻ anion, where oxygen has an oxidation state of −½.
Audio
Pronunciation
Definition
Meaning and Definition
A chemical compound containing the highly reactive O₂⁻ anion, where oxygen has an oxidation state of −½.
In biology, a type of reactive oxygen species (ROS) produced in cells during metabolic processes, often involved in oxidative stress and signaling.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling and usage are identical in technical contexts.
Connotations
Neutral scientific term in both varieties.
Frequency
Equally low-frequency and specialised in both UK and US English, confined to relevant scientific fields.
Grammar
How to Use “superoxide” in a Sentence
[Noun] + superoxidesuperoxide + [Noun][Verb] + superoxideVocabulary
Collocations
Examples
Examples of “superoxide” in a Sentence
adjective
British English
- The superoxide flux was measured.
- Superoxide-mediated damage is a concern.
American English
- Superoxide generation increased.
- The study focused on superoxide activity.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core term in advanced chemistry, biochemistry, and biomedical research papers.
Everyday
Not used in everyday conversation.
Technical
Essential terminology in fields discussing redox reactions, free radical biology, and corrosion.
Vocabulary
Synonyms of “superoxide”
Strong
Neutral
Weak
Vocabulary
Antonyms of “superoxide”
Watch out
Common Mistakes When Using “superoxide”
- Mispronouncing as 'super-ox-ide' with equal stress on all syllables. Correct stress is on 'ox' (/ˌsuːpərˈɒksaɪd/).
- Using 'superoxide' as a general term for any reactive oxygen species (it is a specific one).
- Misspelling as 'superoxside' or 'super oxcide'.
FAQ
Frequently Asked Questions
No. Superoxide (O₂⁻) has one unpaired electron and a charge of -1. Peroxide (O₂²⁻, as in hydrogen peroxide, H₂O₂) has a charge of -2 and no unpaired electrons in its common form.
It is a natural byproduct of cellular respiration in mitochondria, produced by immune cells to kill pathogens, and generated in various industrial and environmental chemical reactions.
It is a key reactive oxygen species (ROS). At low levels, it acts as a signaling molecule. At high levels, it causes oxidative stress, damaging DNA, proteins, and lipids, and is linked to aging and diseases.
The free anion is highly reactive and short-lived in aqueous systems. However, it can form stable salts with certain large cations, like potassium superoxide (KO₂), used in rebreathers and spacecraft.
A chemical compound containing the highly reactive O₂⁻ anion, where oxygen has an oxidation state of −½.
Superoxide is usually technical/scientific in register.
Superoxide: in British English it is pronounced /ˌsuːpərˈɒksaɪd/, and in American English it is pronounced /ˌsuːpərˈɑːksaɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: SUPER charged OXIDE. A super-reactive form of oxygen.
Conceptual Metaphor
A 'toxic spark' or 'chemical aggressor' within cellular processes.
Practice
Quiz
What is the primary enzymatic defence against superoxide in cells?