didymium

[ dahy-dim-ee-uh m, di- ]
/ daɪˈdɪm i əm, dɪ- /

noun Chemistry.

a mixture of neodymium and praseodymium, formerly thought to be an element. Symbol: Di

Origin of didymium

< New 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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British Dictionary definitions for didymium

didymium

/ (daɪˈdɪmɪəm, dɪ-) /

noun

a mixture of the metallic rare earths neodymium and praseodymium, once thought to be an element
a mixture of rare earths and their oxides used in colouring glass

Word Origin for didymium

C19: from New Latin, from Greek didumos twin + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012