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Definition of neodymium:

  1. A rare metallic element occurring in combination with cerium, lanthanum, and other rare metals, and forming amethyst- colored salts. It was separated in 1885 by von Welsbach from praseodymium, the two having previously been regarded as a single element ( didymium). It is chiefly trivalent. Symbol Nd; at. wt. 144. 3.
  2. An elementary substance which forms one of the constituents of didymium. Symbol Nd. Atomic weight 140. 8.

Synonyms:

atomic number 60, Nd.