metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

bastnaesite, bastnasite - a yellow-to-brown mineral that is a source of rare earth elements

monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium

master's degree - an academic degree higher than a bachelor's but lower than a doctor's