1. A hospital for those with contagious diseases.
2. A building or ship used for quarantine.
3. A storage space between the decks of a ship.
Etymology: about 1600, Italian, from lazareto, "a place set aside for performance of quarantine". The Italian word may be a combination of 'Lazarus' (from the biblical parable of Lazarus the beggar) and 'nazaret', from the church of Santa Maria di Nazaret, on a quarantine island near Venice.
In the 1938 movie "Jezebel", sufferers of yellow fever were sent to Lazaret island, near New Orleans. (The island was invented for the film; it does not exist.)