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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 co·run·dum /kəˈrʌndəm/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 co·run·dum /kəˈrəndəm/ 名詞

From: Webster's Revised Unabridged Dictionary (1913)

 Co·run·dum n.; pl. Corundums  [Also corindon.]  Min. The mineral alumina (Al2O3), as found native in a crystalline state.  Transparent varieties are used as gemstones, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.
 Note:The name corundum is sometimes restricted to the non-transparent or coarser kinds. Emery is a dark-colored granular variety, usually admixed with magnetic iron ore.

From: WordNet (r) 2.0

      n : very hard mineral used as an abrasive [syn: corundom]