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.
© Webster 1913
Ne`o*dym"i*um (?), n. [NL. See Neo- , Didymium.] (Chem.)
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.
© Webster 1913