'nightrider' definitions:

Definition of 'nightrider'

From: WordNet
noun
Member of a secret mounted band in United States South after the American Civil War; committed acts of intimidation and revenge [syn: night rider, nightrider]

Definition of 'nightrider'

From: GCIDE
  • nightrider \nightrider\ n. member of a secret mounted band in the southern U. S. after the Civil War, which committed acts of intimidation and revenge.
  • Syn: night rider. [WordNet 1.5] nightrobe