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didymium didymium
/ di5dimjEm /

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◙ noun
1. [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1. mid 19th cent.: from Greek didumos 'twin' (because it was closely associated with lanthanum) + -ium (used as a suffix for new metals)

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