Source : Webster's Revised Unabridged Dictionary (1913)

Rhodium \Rho"di*um\, n. [NL., fr. Gr. "ro`don the rose. So
   called from the rose-red color of certain of its solutions.
   See {Rhododendron}.] (Chem.)
   A rare element of the light platinum group. It is found in
   platinum ores, and obtained free as a white inert metal which
   it is very difficult to fuse. Symbol Rh. Atomic weight 104.1.
   Specific gravity 12.

Source : WordNet®

rhodium
     n : a white hard metallic element that is one of the platinum
         group and is found in platinum ores; used in alloys with
         platinum [syn: {Rh}, {atomic number 45}]