1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Tetrahedrite  \Tet`ra*he"drite\,  n.  [So  called  because  the 
  crystals  of  the  species  are  commonly  tetrahedrons.]  (Min.) 
  A  sulphide  of  antimony  and  copper,  with  small  quantities  of 
  other  metals.  It  is  a  very  common  ore  of  copper,  and  some 
  varieties  yield  a  considerable  presentage  of  silver.  Called 
  also  {gray  copper  ore},  {fahlore},  and  {panabase}. 

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