dysprosium -
A metallic chemical element symbol Dy with an atomic number of 66.
Wikipedia
Dysprosium is a chemical element with the symbol Dy and atomic number 66. It is a rare earth element with a metallic silver luster. Dysprosium is never found in nature as a free element, though it is found in various minerals, such as xenotime.
OmegaWiki Dictionary
Ω
dysprosium Chemical element with symbol Dy and atomic number 66, silvery grey lanthanide.