Definitions for: Corundum

[n] very hard mineral used as an abrasive

Webster (1913) Definition: Co*run"dum (k?-r?n"d?m), n.; pl. Corundums (-d?mz).
[Also corindon.] [From Hind. kurand corundum stone.] (Min.)
The earth alumina, as found native in a crystalline state,
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.

Synonyms: corundom

See Also: alumina, aluminium oxide, aluminum oxide, emery, mineral, ruby, sapphire

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