lazaretto [lazarettos](place reserved for people with infectious diseases (especially leprosy or plague) to live on a long-term basis) noun [UK: ˌlæ.zə.ˈre.təʊ] [US: ˌlæ.zə.ˈreto.ʊ]
leprosery(building used to quarantine and treat lepers, see also: leper colony) noun