corundum

n. 刚玉, 金刚砂 [化] 刚玉

发音

UK /kəˈɹʌn.dəm/
其它
US /kəˈɹʌn.dəm/

词形变化

corundums 复数 corundums

别名

curundum

释义与例句

n.
  1. 1.

    An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive.

    刚玉

    可数 不可数 化学 地质

词汇关系

名词

上位词 1

mineral

下位词 5

ruby sapphire alumina aluminium oxide aluminum oxide

整体词 1

emery

词源

From Tamil குருந்தம் (kuruntam, “ruby, sapphire”) First attested in the early 18th century.

来源：wiktionary