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n. [ NL. See Gadolinite. ] (Chem.) A rare earth associated with yttria and regarded as the oxide (Gd2O3) of a metallic element, gadolinium. [ Webster 1913 Suppl. ]

a. (Chem.) Pertaining to or containing gadolinium. [ 1913 Webster ]

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 ]

n. [ See Indol. ] (Chem.) A dark resinous substance, polymeric with indol, and obtained by the reduction of indigo white. [ 1913 Webster ]

n. [ Iridescent + L. oleum oil. ] (Chem.) A nitrogenous base C10H9N, extracted from coal-tar naphtha, as an oily liquid. It is a member of the quinoline series, and is probably identical with lepidine.