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.
宝石学家仔细检查了刚玉以确定其质量。
translation
刚玉
词形变化
Plural
corundums