radium

English Thesaurus

1. an intensely radioactive metallic element that occurs in minute amounts in uranium ores (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	:	uranium ore,
definition	:	any ore from which uranium can be extracted (noun.substance)