1. Any of a series of metallic chemical elements with atomic numbers 57 through 71, characterized by similar chemical properties and used in various industrial and technological applications.
Usage: Also called lanthanide or rare earth element.; Technical/scientific term.

Examples

• Lanthanon elements are essential components in modern electronics and renewable energy technologies.
• The lanthanon series includes elements such as lanthanum, cerium, and erbium.
• Scientists study lanthanon compounds to develop more efficient catalysts.
• Lanthanon metals are often found together in nature and are difficult to separate.