(also rare-earth element or metal )
■ noun Chemistry any of a group of chemically similar metallic elements comprising the lanthanide series and (usually) scandium and yttrium.
(also rare-earth element or metal )
■ noun Chemistry any of a group of chemically similar metallic elements comprising the lanthanide series and (usually) scandium and yttrium.
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004