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

< 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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To didymium
World English Dictionary
didymium (daɪˈdɪmɪəm, dɪ-)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Example sentences
He named the element didymium, as it was an inseparable twin brother of lanthanum.
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature