A staunch or extreme supporter of papal authority; the most devoted believer in the Pope's supremacy.
From arch- (meaning 'chief' or 'extreme') plus papist (from pope, derived from Latin papa, 'father'). Created by Protestant writers who wanted to insult the most zealous Catholics.
During the Reformation, Protestants used labels like 'archpapist' as insults for Catholics who refused to question the Pope—it's basically calling someone a 'super-Catholic' in a mocking way.
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