/lænˈθænɪdi/ LAN-tha-ni-dee

Definitions

1. noun

any of a series of chemical elements with atomic numbers ranging from 57 to 71, characterized by the presence of unpaired electrons in the 4f orbitals.

“The team of scientists studied the properties of the lanthanide elements to develop new superconducting materials.”

2. adjective

relating to or characteristic of the lanthanide elements.

“The lanthanide series is a group of elements with unique magnetic properties.”