didymium

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

Origin:
< Neo-Latin < Greek 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

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didymium (daɪˈdɪmɪəm, dɪ-)
 
n
1.  a mixture of the metallic rare earths neodymium and praseodymium, once thought to be an element
2.  a mixture of rare earths and their oxides used in colouring glass
 
[C19: from New Latin, from Greek didumos twin + -ium]

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Example sentences
He named the element didymium, as it was an inseparable twin brother of lanthanum.
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