Source : Webster's Revised Unabridged Dictionary (1913)

Foyer \Foy`er"\, n. [F., fr. LL. focarium fireplace. See
   {Focus}, n.]
   1. A lobby in a theater; a greenroom.

   2. The crucible or basin in a furnace which receives the
      molten metal. --Knight.

Source : WordNet®

foyer
     n : a large entrance or reception room or area [syn: {anteroom},
          {antechamber}, {entrance hall}, {hall}, {lobby}, {vestibule}]