atomic number 63

English Thesaurus

1. a bivalent and trivalent metallic element of the rare earth group (noun.substance)

hypernym	:	metal, metallic element,
definition	:	any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. (noun.substance)

substance meronym	:	monazite,
definition	:	a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium (noun.substance)