Definition of sectarianize in US English:

sectarianize

(British sectarianise)

verb

[with object]
  • Divide into sects; make sectarian.

    ‘they chose to sectarianize society by sowing the seeds of intolerance’
    ‘a sectarianized state’

Pronunciation

sectarianize

/sekˈterēəˌnīz//sɛkˈtɛriəˌnaɪz/