Source : Webster's Revised Unabridged Dictionary (1913)

Gadolinium \Gad`o*lin"i*um\, with an assigned atomic weight of
   153.3. Gaekwar \Gaek"war\, n. [Also Gaikwar, Guicowar.]
   [Marathi g[=a]ekw[=a]r, prop., a cowherd.]
   The title of the ruling Prince of Baroda, in Gujarat, in
   Bombay, India.

Gadolinium \Gad`o*lin"i*um\, n. [NL. See {Gadolinite}.] (Chem.)
   A supposed rare metallic element, with a characteristic
   spectrum, found associated with yttrium and other rare
   metals. Its individuality and properties have not yet been
   determined.

Source : WordNet®

gadolinium
     n : a ductile silvery-white ductile ferromagnetic trivalent
         metallic element of the rare earth group [syn: {Gd}, {atomic
         number 64}]