| 单词 | corundum |
| 释义 | corundum (once / 38251 pages) n WORD FAMILY corundum: corundums USAGE EXAMPLESThe Bronco mane and eyeball were created from orange sapphires while the head features pave-set diamonds and custom-cut corundum blue stone. Washington Times(Jun 12, 2016) For centuries esteemed mines in Kashmir, Sri Lanka, and Burma have produced highly sought after corundum, the extremely durable mineral that forms rubies and sapphires. Forbes(Dec 03, 2014) “The softest mineral on the scale is talc rising to quartz at number seven and diamond is 10. Corundum, which is sapphire, is number nine.” The Guardian(Jul 21, 2014) n very hard mineral used as an abrasive Syn|Hypo|Hyper corundom 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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