segregationistseg‧re‧ga‧tion‧ist /ˌseɡrɪˈɡeɪʃənɪst/ adjective 
relating to the practice of keeping people of different races, sexes, or religions separate: 
segregationist policies—segregationist noun [countable]
relating to the practice of keeping people of different races, sexes, or religions separate: segregationist policies—segregationist noun [countable]