corundum
noun/kəˈrʌndəm/
Frequency rank: #19,779 of 20,003 in the WORDED list (wordfreq data)
Meaning
A very hard mineral (aluminum oxide) that forms gems such as rubies and sapphires.
Example sentence
The gemologist explained that rubies and sapphires are both varieties of corundum.
Synonyms & related words
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