didymium

noun di·dym·i·um \dī-ˈdi-mē-əm\

Definition of DIDYMIUM

: a mixture of rare-earth elements made up chiefly of neodymium and praseodymium and used especially for coloring glass for optical filters

New Latin, from Greek didymos twin, from dyo two — more at two

First Known Use: 1842

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