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didymium

 [dahy-dim-ee-uhm, di-]  

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
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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 is always a great word to know.
So is ethereal. Does it mean:
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals
pertaining to, containing, or resembling ethyl ether
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Collins
World English Dictionary
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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