Source : Webster's Revised Unabridged Dictionary (1913)

Tambac \Tam"bac\, n. (Metal.)
   See {Tombac}. [Obs.]

Source : WordNet®

tambac
     n : an alloy of copper and zinc (and sometimes arsenic) used to
         imitate gold in cheap jewelry and for gilding [syn: {tombac},
          {tombak}]