old catholic

noun

1. a member of any of several European churches professing to be truly Catholic but rejecting certain modern Roman Catholic doctrines, dogmas, and practices, especially the dogma of papal infallibility.
2. a member of any of several minor churches, especially in the U.S., differing from the Roman Catholic Church chiefly in their rejection of the ecclesiastical authority of the Roman Catholic hierarchy.

adjective

1. of or relating to several small national Churches which have broken away from the Roman Catholic Church on matters of doctrine

noun

2. a member of one of these Churches