alumina: meaning, definition, pronunciation and examples
C1/C2Formal, Academic, Technical, Industrial
Quick answer
What does “alumina” mean?
A white, crystalline, inorganic compound of aluminum and oxygen (Al₂O₃), which is the principal component of bauxite and is used in producing aluminum metal and as an abrasive and refractory material.
Audio
Pronunciation
Definition
Meaning and Definition
A white, crystalline, inorganic compound of aluminum and oxygen (Al₂O₃), which is the principal component of bauxite and is used in producing aluminum metal and as an abrasive and refractory material.
It can also refer to forms of this compound used in ceramics, advanced materials (e.g., synthetic sapphire, ruby), and various industrial catalysts.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage.
Connotations
None beyond its technical definition.
Frequency
Equally rare in everyday speech, but standard in technical/industrial contexts in both regions.
Grammar
How to Use “alumina” in a Sentence
The alumina was extracted from the ore.Alumina is used in the manufacture of X.The process yields high-purity alumina.Vocabulary
Collocations
Examples
Examples of “alumina” in a Sentence
adjective
British English
- The alumina catalyst was highly effective.
- They studied alumina-based composites.
American English
- The alumina ceramic proved durable.
- Alumina-rich bauxite is preferred.
Usage
Meaning in Context
Business
Used in reports on mining, commodities trading, or industrial manufacturing (e.g., 'The company's alumina output rose by 5% this quarter').
Academic
Used in chemistry, materials science, geology, and engineering textbooks and papers.
Everyday
Virtually never used in casual conversation.
Technical
The primary domain. Used in specifications for ceramics, metallurgy, catalysts, and advanced material synthesis.
Vocabulary
Synonyms of “alumina”
Strong
Neutral
Weak
Watch out
Common Mistakes When Using “alumina”
- Pronouncing it as /æljuːˈmaɪnə/ (like 'aluminium' without the -ium).
- Using it interchangeably with 'aluminium' (the metal).
FAQ
Frequently Asked Questions
No. Alumina (Al₂O₃) is a compound of aluminium and oxygen. Aluminium is the pure metal (Al) produced from alumina.
There isn't one. It is a technical term. Sometimes it is called 'aluminium oxide' in more general scientific contexts.
Yes, in its crystalline form it is the mineral corundum (which includes rubies and sapphires). Its main commercial source, however, is bauxite ore.
It is the essential intermediate product in aluminium production and has valuable properties (hardness, heat resistance) used in abrasives, refractories, ceramics, and advanced materials.
A white, crystalline, inorganic compound of aluminum and oxygen (Al₂O₃), which is the principal component of bauxite and is used in producing aluminum metal and as an abrasive and refractory material.
Alumina is usually formal, academic, technical, industrial in register.
Alumina: in British English it is pronounced /əˈluːmɪnə/, and in American English it is pronounced /əˈluːmɪnə/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'ALUMINium' is made from 'alumina'.
Conceptual Metaphor
Not applicable; the word is a technical, literal term.
Practice
Quiz
In which of the following products would you most likely find alumina as a key component?