schismatic /siz-matˈik or skiz-/ noun

1. Someone who favours a schism or belongs to a schismatic body
2. A Catholic who avoided penalties by occasional conformity (RC)

(also schismatˈical) tending to, favouring, or of the nature of, a schism

schismatˈically adverb

schismatˈicalness noun

schisˈmatize or schisˈmatise intransitive verb

1. To practise schism
2. To make a schism

schism house or schism shop noun (old, esp 19c)

Contemptuous Anglican terms for a nonconformist church

great Eastern (or Greek) schism

The separation of the Greek church from the Latin, finally completed in 1054

(great) Western schism

The division in the Western Church from 1378 to 1417, when there were antipopes under French influence at Avignon