Definition

A very hard mineral made of aluminum oxide, often used in making gemstones like rubies and sapphires, and also used as an abrasive material.

Example

Corundum is the mineral from which sapphires and rubies are formed.

Conversation

I read that corundum is one of the hardest minerals on Earth.

Yeah, it’s fascinating how it’s used for making rubies and sapphires.

I had no idea it could be synthesized too!

Exactly! Plus, it's great for abrasives.

Synonyms & Antonyms

Root Explanation

Corundum originates from the Tamil word 'kurundam', meaning a type of mineral or stone. It refers specifically to a crystalline form of aluminum oxide, often used as an abrasive.

Memory Tip

Think of the Tamil word 'kurundam' which refers to a mineral — this helps you remember that corundum is a type of mineral.

Visually Confused Words