ghetto

Short definition from Wiktionary

Noun

1. 1
   An (often walled) area of a city in which Jews are concentrated by force and law. (Used particularly of areas in medieval Italy and in Nazi-controlled Europe.)
2. 2
   An (often impoverished) area of a city inhabited predominantly by members of a specific nationality, ethnicity, or race.
3. 3
   An area in which people who are distinguished by sharing something other than ethnicity concentrate or are concentrated.
4. 4
   An isolated, self-contained, segregated subsection, area or field of interest; often of minority or specialist interest.

Adjective

1. 1
   Of or relating to a ghetto or to ghettos in general.
2. 2
   Unseemly and indecorous or of low quality; cheap; shabby, crude.
3. 3
   Characteristic of the style, speech, or behavior of residents of a predominantly black or other ghetto in the United States.
4. 4
   Having been raised in a ghetto in the United States.

Verb

1. 1
   To confine (a specified group of people) to a ghetto.