corundum
/kuh-ruhn-duhm/US // kəˈrʌn dəm //UK // (kəˈrʌndəm) //
刚玉,刚玉石,金刚石,金刚砂
Related Words
Definitions
n.名词 noun
- 1
- : a common mineral, aluminum oxide, Al2O3, notable for its hardness: transparent varieties, as sapphire and ruby, are used as gems, other varieties as abrasives: often made synthetically.
Synonyms & Antonyms
Examples
Pliny says, corundum was used in the form of a splinter fixed in an iron style.
The stones have been rubbed into shape apparently by corundum.
This is true whether it has reference to a grindstone, emery, corundum wheel, or a plain oil stone.
Corundum and pure emery are ores that are very rich in aluminum, containing about fifty-four per cent.
Corundum is the hardest substance known, next to the diamond.
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