• A rare metallic substance usually associated with the metalcerium; -- hence its name. It was formerly supposed to be an element,but has since been found to consist of two simpler elementarysubstances, neodymium and praseodymium. See Neodymium, andPraseodymium.


    Didymium meaning & definition 1 of Didymium.


  • 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.

    Didymium meaning & definition 2 of Didymium.

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