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Meaning of CORUNDUM

Pronunciation:  ku'rundum

 
WordNet Dictionary
 
 Definition: 
[n]  very hard mineral used as an abrasive
 

CORUNDUM is a 8 letter word that starts with C.

 

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

 

 

Webster's 1913 Dictionary
 
 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.

 

 

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