corundum 的定义
- 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.
corundum 近义词
等同于 diamond
更多corundum例句
- 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.