Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Corundum \Co*run"dum\ (k[-o]*r[u^]n"d[u^]m), n.; pl. {Corundums}
(k[-o]*r[u^]n"d[u^]mz). [Also corindon.] [From Hind. kurand
corundum stone.] (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.
[1913 Webster +PJC]
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.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
corundum
n 1: very hard mineral used as an abrasive [syn: {corundom},
{corundum}]
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