Source : Webster's Revised Unabridged Dictionary (1913)

Restaurant \Res"tau*rant\ (r?s"t?*r?nt;277), n. [F., fr.
   restaurer. See {Restore}.]
   An eating house.

Source : WordNet®

restaurant
     n : a building where people go to eat [syn: {eating house}, {eating
         place}]