Bible Dictionaries
Didymium
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Didymium'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/didymium.html. 1828.