The greatest, most notorious, or most prolific murderer; a killer of supreme or extreme infamy.
From 'arch-' (supreme, chief) + 'murderer' (one who commits murder). 'Murderer' comes from Old English 'morther,' possibly from Proto-Germanic meaning 'to deprive of life.'
History's archmurderers weren't always obvious—Stalin and Mao killed millions through policy rather than individual acts, making them arguably worse than serial killers. The word shows how 'arch-' applies to the most extreme versions of everything, good or evil.
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