| 单词 | corundum |
| 释义 | corundum /keuh run"deuhm/, n. 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. [1720-30; < Tamil kuruntam; akin to Skt kuruvinda ruby] |
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