schis ‧ m /ˈskɪz ə m, ˈsɪz ə m/ BrE AmE noun [uncountable and countable]
[ Date: 1300-1400 ; Language: Old French ; Origin: cisme , from Late Latin schisma , from Greek , 'division' , from schizein 'to split' ]
the separation of a group into two groups, caused by a disagreement about its aims and beliefs, especially in the Christian church SYN split
—schismatic /sɪzˈmætɪk, skɪz-/ adjective