Source : Webster's Revised Unabridged Dictionary (1913)

Aluminum \A*lu"mi*num\ ([.a]*l[=u]*m[i^]*n[u^]m), n.
   See {Aluminium}.

Source : WordNet®

aluminum
     n : a silvery ductile metallic element found primarily in
         bauxite [syn: {aluminium}, {Al}, {atomic number 13}]