Source : Webster's Revised Unabridged Dictionary (1913)

Holmium \Hol"mi*um\, n. [NL., of uncertain origin.] (Chem.)
   A rare element said to be contained in gadolinite. --
   {Hol"mic}, a.

Source : WordNet®

holmium
     n : a trivalent metallic element of the rare earth group; occurs
         together with yttrium; forms highly magnetic compounds
         [syn: {Ho}, {atomic number 67}]