Source : Webster's Revised Unabridged Dictionary (1913)

Lazar \La"zar\, n. [OF. lazare, fr. Lazarus the beggar. Luke
   xvi. 20.]
   A person infected with a filthy or pestilential disease; a
   leper. --Chaucer.

         Like loathsome lazars, by the hedges lay. -- Spenser.

   {Lazar house} a lazaretto; also, a hospital for quarantine.

Source : WordNet®

lazar house
     n : hospital for persons with infectious diseases (especially
         leprosy) [syn: {lazaretto}, {lazaret}, {lazarette}, {pesthouse}]