1) One favoring church law 
• (n.) One who supports of advocates prelacy, or the government of the church by prelates; hence, a high-churchman.
Prel'a·tist noun One who supports of advocates prelacy, or the government of the church by prelates; hence, a high-churchman. Hume. « I am an Episcopalian, but not a prelatist .» T. Scott.