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didymium
Definitions
[dɪˈdɪmɪəm], (Noun)
Definitions:
- 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
Phrases:
Origin
:
mid 19th century: from Greek didumos ‘twin’ (because it was closely associated with lanthanum) + -ium (used as a suffix for new metals)
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definition by Oxford Dictionaries