dysprosium

/dɪsˈproʊziəm/
noun
  1. A silvery-white metallic chemical element (symbol Dy) used in magnets, lasers, and nuclear reactors.
    • Scientists use dysprosium in certain types of nuclear control rods.
    • The mining of dysprosium has increased due to demand for green energy technologies.
    • Dysprosium is an important component in high-strength permanent magnets.