didymium
/daɪˈdɪmɪəm/noun
mass noun
- Chemistry a mixture containing the rare earth elements praseodymium and neodymium, used to colour glass for optical filters. It was originally regarded as a single element.【化】钕镨混合物。
词源
mid 19th cent.: from Greek didumos 'twin' (because it was closely associated with lanthanum) + -ium (used as a suffix for new metals).