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Definition of Gadolinia

• [n.] - A rare earth, regarded by some as an oxide of the supposed element gadolinium, by others as only a mixture of the oxides of yttrium, erbium, ytterbium, etc.
• [n.] - A rare earth associated with yttria and regarded as the oxide (Gd2O3) of a metallic element, Gad`o*lini*um (/), with an assigned atomic weight of 153.3.