cerium
/ˈsɪriəm/
noun
- A soft, silvery-white metallic chemical element that is used in alloys, glass, and as a catalyst.
- Some lighter flints contain cerium, which creates sparks when struck.
- Cerium is often used in the production of self-cleaning ovens because it helps break down grease.
- The scientist explained that cerium is one of the most abundant rare earth elements in the Earth's crust.