General Science

  • noun a silvery-white metallic element that occurs with platinum and is used for plating jewellery and in alloys

Cars & Driving

  • noun a silver-white noble metal in the platinum family; atomic number 45, atomic weight 102.905; used in thermocouples and, together with other platinum metals, as a catalyst in catalytic converters.


  • A lustrous silvery-white chemical element whose atomic number is 45. It is rare, resists almost every acid, and has nearly 30 known isotopes, of which one is stable. Its applications in electronics include its use in corrosion-resistance contacts, electrodes, thermocouples, high-reflectivity mirrors, optical instruments, and in oxidation-resistant and high-temperature alloys with platinum and iridium. Its chemical symbol is Rh.
  • chemical symbolRh