di·​dym·​i·​um dī-ˈdi-mē-əm How to pronounce didymium (audio)
: a mixture of rare earth elements made up chiefly of neodymium and praseodymium and used especially for coloring glass for optical filters

Word History


New Latin, from Greek didymos twin, from dyo two — more at two

First Known Use

1842, in the meaning defined above

Time Traveler
The first known use of didymium was in 1842

Dictionary Entries Near didymium

Cite this Entry

“Didymium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/didymium. Accessed 22 May. 2024.

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