Definition

Noun: A synthetic, fused, crystalline form of alumina (aluminum oxide, Al₂O₃), used primarily as an abrasive material and in refractory products due to its high hardness and heat resistance.

Usage

"Alundum" is a technical and industrial term. It refers specifically to the manufactured, fused product, not to naturally occurring alumina or other forms. It is typically used as a mass noun (uncountable) to describe the material itself.

Examples

• The grinding wheel was made from a bonded alundum abrasive.
• High-temperature furnace linings often incorporate alundum for its refractory properties.
• Alundum is valued for its durability in cutting and polishing applications.

Advanced Usage

• The term is often used attributively (like an adjective) to describe products made from this material.
  • Example: The workshop ordered new alundum stones for sharpening tools.

Variants and Related Words

• Alumina (noun): The chemical compound aluminum oxide (Al₂O₃), which is the base material for alundum. Alumina can occur naturally or be synthesized in various forms.
• Corundum (noun): A naturally occurring crystalline form of alumina, of which ruby and sapphire are gem varieties. Alundum is the synthetic, fused equivalent used industrially.
• Abrasive (noun/adjective): A general term for a hard material used for grinding, polishing, or cleaning. Alundum is a type of abrasive.

Synonyms

• Fused alumina
• Synthetic corundum (in an industrial context)
• Aluminum oxide abrasive (a more general descriptive term)

Notes on Meaning

This word has a single, specific technical meaning related to materials science and manufacturing. It does not have idiomatic uses or phrasal verbs.

Noun

1. a substance made of fused alumina