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didymium n. 一种化学混合物 一种化学混合物 Didymium \Di*dym"i*um\, n. [NL., fr. Gr. ? twin.] (Chem.)
A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See {Neodymium}, and {Praseodymium}. [1913 Webster]
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