Jim Crow
Concise Oxford English Dictionary © 2008 Oxford University Press:
Jim Crow/ʤɪmˈkrəʊ/
▶noun US
- 1 the former practice of segregating black people in the US.
- 2 offensive a black person.
- 3 an implement for straightening iron bars or bending rails by screw pressure.
– derivatives
Jim Crowism noun.
Jim Crowism noun.
– origin C19: the name of a black character in a plantation song.
'Jim Crow' also found in these Oxford entries:

