Anyone who makes a protest against some action.

1. A member or adherent of any denomination of the Western Christian church that rejects papal authority and some fundamental Roman Catholic doctrines, and who believes in the justification by faith.
2. Any Western Christian who is not an adherent of a Catholic, Anglican, or Eastern Church.
2. A believer of any of those Christian bodies that separated from the Church of Rome during the Reformation, or of any group descended from them.