corundum

名词 n.
中文释义
英 /kəˈɹʌn.dəm/    美 /kəˈɹʌn.dəm/

英文释义

名词 n.
  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. countable,uncountable

词形变化

corundums plural

词源

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