corundum

Pronunciation

• (UK) (US) IPA ^(key): /kəˈrʌn.dəm/

• Audio (UK)

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Noun

Singular corundum

Plural corundums

Corundum

1. (mineralogy) (countable & uncountable) Corundum is an extremely hard mineral that is used as an abrasive.

   Sapphire and ruby are varieties of corundum.