Church of Rome churc·hof·rome uncommon noun 1. the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy SynonymsRoman CatholicWestern ChurchRoman Catholic ChurchChurch of RomeRoman Church Related words Broader terms Catholic Church Part of RomeCuriaSacred CollegeRoman Catholic WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.