səˈma(a)rēəm noun
( -s )
Etymology: New Latin, from French samar skite + New Latin -ium — more at samarskite
: a pale gray lustrous metallic element of the rare-earth group that occurs associated especially with cerium, yttrium, and neodymium in rare-earth minerals and that is bivalent and trivalent in red-brown and pale yellow compounds respectively — symbol Sm ; see element table