Merriam-Webster Collegiate Dictionary - lazaretto

 or lazaret; also lazarette  noun  (plural -rettos or -rets; also -rettes)  Etymology: Italian lazzaretto, alteration of Nazaretto, quarantine station in Venice, from Santa Maria di Nazareth, church on the island where it was located  Date: 1549  1. (usually ~) an institution (as a hospital) for those with contagious diseases  2. a building or a ship used for detention in quarantine  3. (usually lazaret or lazarette) a space in a ship between decks used as a storeroom