aluminum oxide

noun

: the oxide of aluminum Al₂O₃ that occurs both in pure form as corundum and in hydrated forms (as in bauxite) and that has superior strength and hardness

Producers first separate out … aluminum oxide from the bauxite using heat, then strip off the oxygen from the aluminum using electrolysis.

—Troy Wolverton

Examples of aluminum oxide in a Sentence

Recent Examples on the Web

Satellite bodies are mostly made of aluminum, which likely turns into aluminum oxide when burned in the presence of oxygen. — Tereza Pultarova, Space.com, 11 Aug. 2026

The process begins with a bulk sample of the material that is pressed into a porous aluminum oxide mold at high temperatures. — Georgina Jedikovska, Interesting Engineering, 17 July 2026

Then, raising the temperature to 700° C causes the aluminum trifluoride to react with water, leaving behind aluminum oxide and releasing yet more hydrogen fluoride. — ArsTechnica, 28 May 2026

Threats to the ozone layer continue, from, for example, chlorine-containing molecules emitted by massive wildfires and aluminum oxide produced when satellites and other space objects burn up upon reentry into the atmosphere. — Andrea Thompson, Scientific American, 22 Apr. 2026

Word History

First Known Use

1869, in the meaning defined above

Rhymes for aluminum oxide

• aminoglycoside
• chlordiazepoxide
• dimethylformamide
• oligosaccharide
• paraformaldehyde
• polynucleotide
• ribonucleotide
• abide
• allied
• applied
• aside
• astride

Kids Definition

aluminum oxide

noun

: alumina

Medical Definition

aluminum oxide

noun

: alumina