corundum

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Definitions from WordNet

Noun corundum has 1 sense

corundom, corundum - very hard mineral used as an abrasive
--₁ is a kind of mineral
--₁ is a substance of emery
--₁ has particulars:
alumina, aluminum oxide, aluminium oxide; ruby; sapphire

Definitions from the Web

Corundum

Noun (Mineralogy):

A crystalline form of aluminium oxide, typically occurring in prismatic crystals of various colors, and used as a gemstone.

Example Sentence:

She admired the beautiful corundum gemstone on her necklace.

Noun (Geology):

The hardest known naturally occurring substance after diamond, used as an abrasive and in the manufacture of refractory products.

Example Sentence:

The corundum particles were added to the grinding wheel to enhance its abrasive properties.

Noun (Chemistry):

A white or grayish-blue gritty material produced synthetically from aluminum oxide, used in the manufacture of ceramics and abrasives.

Example Sentence:

The chemist mixed the aluminum oxide with other compounds to successfully create corundum.

Adjective:

Relating to or resembling corundum.

Example Sentence:

The jewelry designer used corundum hues to create a stunning collection.