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Didymium - 3 dictionary results

di⋅dym⋅i⋅um

[dahy-dim-ee-uhm, di-]
–noun Chemistry.
a mixture of neodymium and praseodymium, formerly thought to be an element. Symbol: Di

Origin:
< NL < Gk dídym(os) twin (see didymous ) + -ium; so named by Swedish chemist Carl Mosander (1797–1858), who discovered it in 1843, from its close association with lanthanum
di·dym·i·um   (dī-dĭm'ē-əm)   
n.  
  1. Symbol Di A metallic mixture, once considered an element, composed of neodymium and praseodymium.
  2. A mixture of rare-earth elements and oxides used chiefly in manufacturing and coloring various forms of glass.

[From Greek didumos, twin, double; see dwo- in Indo-European roots.]

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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