Ne′o‐dym″i‐um (?), n. [NL. Dee Neo-, and Didymium.] (Chem.) An elementary substance which forms one of the constituents of didymium. Symbol Nd. Atomic weight 140.8.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.