The origin of the word ghetto comes from the dialect spoken in Venezia, aka Venice for english-spoken people, and probably was created during 1400-1500. It was used to define the place where jewish people live and have their bussinesses,
separated from the oligarchy that ruled Venezia in that period , that was mainly connected with commerce on the Mediterranean
Sea.I think people in Venezia could haven't believed that this word would have such a fortune. Of course this word can mean all the other entries are in this this useful slang dictionary.
Nowadays if u go 2 Venezia in Northern Italy u'll find the real first ghetto in history