1. a soft, silvery-white metallic chemical element of the lanthanide series, used in alloys, catalysts, and optical applications.
Usage: chemistry; symbol: Ce; atomic number: 58

Examples

• Cerium is one of the most abundant rare earth elements.
• The catalyst contains cerium oxide to improve fuel efficiency.
• Cerium was first isolated in 1803 by Swedish chemists.
• Cerium compounds are used in self-cleaning oven liners.
• The alloy includes cerium to enhance its strength and durability.