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didymium |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: 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}.
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