Etymology
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gadolinium (n.)

metallic element, with element ending -ium + gadolinia, an earth named 1886 by J.C. Marginac in honor of Johan Gadolin (1760-1852), Finnish mineralogist and chemist, who in 1794 first began investigation of the earth (subsequently called gadolinite, 1802) which eventually yielded this element and several others.

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Definitions of gadolinium

gadolinium (n.)
a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group;
Synonyms: Gd / atomic number "
From wordnet.princeton.edu