Webster's English Dictionary

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iridium

Cross references:
  1. element               
 
irid.i.um \ir-'id-e--*m\ n [NL, fr. L irid-, iris; fr. the colors produced 
   by its dissolving i]n hydrochloric acid : a silver-white hard brittle very 
   heavy chiefly trivalent and tetravalent  metallic element of the platinum 
   group