n. [ Named after Gadolin, a Russian chemist. ] (Min.) A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron. [ 1913 Webster ]
n. [ NL. See Gadolinite. ] (Chem.) A rare earth metallic element of the Lanthanide series, with a characteristic spectrum, found associated with yttrium and other rare earth elements. Symbol, Gd; it has an atomic number of 64, an atomic weight of 157.25 (C=12.011), and a valence of +3. [ 1913 Webster +PJC ]
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