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corundum

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corundum


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Corundum  \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. 
 
  From  WordNet  r  1.6  [wn]: 
 
  corundum 
  n  :  very  hard  mineral  used  as  an  abrasive  [syn:  {corundom}] 




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