1. a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium
source: wordnet30
2. An elementary substance which forms one of the constituents of didymium. Symbol Nd. Atomic weight 140.8.
source: webster1913
3. 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.
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