| 单词 | corundom |
| 释义 | corundom (extremely rare) n WORD FAMILY corundom n very hard mineral used as an abrasive Syn|Hypo|Hyper corundum alumina, aluminium oxide, aluminum oxide any of various forms of aluminum oxide occurring naturally as corundum rubya transparent deep red variety of corundum; used as a gemstone and in lasers sapphirea precious transparent stone of rich blue corundum valued as a gemstone alunduma substance made of fused alumina star sapphirea sapphire that when cut shows a starlike figure in reflected light because of its crystalline structure mineral solid homogeneous inorganic substances occurring in nature having a definite chemical composition |
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