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[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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for didymium


/daɪˈdɪmɪəm; dɪ-/
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
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
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