Webster's Revised Unabridged Dictionary · 1913

Ghetto

Ghetto , noun

[Italian]

A quarter of a city where Jews live in greatest numbers.
I went to the Ghetto, where the Jews dwell. — Evelyn
2.
Any section of a town inhabited predominantly by members of a specific ethnic, national or racial group, such segregation usually arising from social or economic pressure. The term is commonly applied to areas in cities having a high concentration of low-income African-Americans.
3.
Any isolated group of people. [figurative]
4.
Any group isolated by external pressures, with an implication of inferiority. [figurative]