Definition of segregationist in US English:

segregationist

adjective

  • Relating to or advocating the policy of enforced separation of different racial groups.

    ‘segregationist politicians’
    ‘haunting images from the nation's segregationist past’

noun

  • A person who supports the policy of enforced separation of different racial groups.

    ‘a time when staunch segregationists dominated the political structure’

Pronunciation

segregationist

/ˌseɡrəˈɡāSH(ə)nəst//ˌsɛɡrəˈɡeɪʃ(ə)nəst/