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