Webster's English Dictionary

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platinum

Cross references:
  1. element               
 
plat.i.num \'plat-n*m, -*n-*m\ n [NL, fr. Sp platina, fr. dim. of plata 
   silver - more at PLATE)] often attribM 1: a heavy precious grayish white 
   noncorroding ductile malleable metallic e lement that fuses with difficulty 
   and is used esp. in chemical ware and apparatus, as a catalyst, and in 
   dental and jewelry alloys 2: a moderate gray