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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Iridosmine  \Ir`i*dos"mine\,  Iridosmium  \Ir`i*dos"mi*um\,  n. 
  [Iridium  +  osmium.]  (Min.) 
  The  native  compound  of  iridium  and  osmium.  It  is  found  in 
  flattened  metallic  grains  of  extreme  hardness,  and  is  often 
  used  for  pointing  gold  pens.