corundum
🇺🇸
/kəˈrʌndəm/
🇬🇧
/kəˈrʌndəm/
noun
R
A mineral that is very hard and used to make gemstones like rubies and sapphires.
The gemologist examined the corundum closely to determine its quality.
寶石學家仔細檢查了剛玉以確定其質量。
translation
刚玉
詞形變化
Plural
corundums