1. Plural of corundum; a hard crystalline mineral form of aluminum oxide, used as an abrasive and in gemstones such as rubies and sapphires.
Usage: Typically used in technical, industrial, or geological contexts.

Examples

• Corundums are among the hardest naturally occurring minerals on Earth.
• The jeweler examined several corundums to select the finest rubies for the necklace.
• Industrial corundums are widely used in grinding wheels and sandpaper.
• Synthetic corundums have been manufactured for decades to meet commercial demand.
• The geologist identified corundums in the rock sample using X-ray diffraction.