lanthanide
/ˈlænθənaɪd/
noun
- Any of a series of 15 metallic elements with atomic numbers 57 through 71, from lanthanum to lutetium, that are part of the rare earth elements.
- Many lanthanides are found in the same mineral deposits and are difficult to separate.
- The chemist explained how lanthanides glow under ultraviolet light.
- Lanthanides are used in making powerful magnets for electronics and wind turbines.