Source : Webster's Revised Unabridged Dictionary (1913)

Gadolinia \Gad`o*lin"i*a\, n. [NL. See {Gadolinite}.]
   A rare earth associated with yttria and regarded as the oxide
   ({Gd2O3}) of a metallic element,

Gadolinia \Gad`o*lin"i*a\, n. [NL. See {Gadolinite}.] (Chem.)
   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.