Definition of didymium Didymium
di•dym•i•um
We found 3 definitions of didymium from 3 different sources.
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What does didymium mean?
Wiktionary 
- didymium (Noun)
A mixture of praseodymium and neodymium once thought to be an element symbol Di.
Webster DictionaryWebster's Unabridged Dictionary 📘
- didymium (n.)
A rare metallic substance usually associated with the metal cerium; -- hence its name. It was formerly supposed to be an element, but has since been found to consist of two simpler elementary substances, neodymium and praseodymium. See Neodymium, and Praseodymium.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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didymium
dī-dim′i-um, n. a supposed element discovered in 1841, so named from being, as it were, twin brother of lanthamum
