corundum

IPA(Pronunciation)

/kəˈɹʌn.dəm/

Noun

countable uncountable

(mineralogy) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

Japanese Meaning

極めて硬い鉱物。酸化アルミニウム（Al₂O₃）の一種で、サファイアやルビーとして宝石に用いられる。また、研磨材としても利用される。

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Google Translation / DeepL Translation

宝石商は、深い青色の石が実は酸化アルミニウム（Al₂O₃）の結晶であり、その硬さから重宝されていると説明した。

Details

Sense（1）

(mineralogy) An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

corundums

（ plural ）

Details

corundum

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