rare-earth elementrare-earth element
any of the series of metallic chemical elements, with consecutive atomic numbers of 57 (lanthanum) through 71 (lutetium) inclusive
often called rare-earth metal
Any of a group of 17 naturally occurring metallic elements that have similar properties, consisting of scandium, yttrium, and the 15 elements with atomic numbers 57 through 71 (the lanthanides). The rare-earth elements are widely used in electronics and other high-tech products.
Origin of rare-earth elementrare earth