sectarianize

From sectarian +‎ -ize.

sectarianize (third-person singular simple present sectarianizes, present participle sectarianizing, simple past and past participle sectarianized)

1. (transitive) To render sectarian; to put into a sect.

• “sectarianize”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.