A person or device that decapitates; something that removes the head.
From 'decapitate' + '-or' (agent suffix), referring to either a person who performs decapitation or a mechanical device designed to do so, such as a guillotine.
The guillotine was promoted as a 'humane' decapitator during the French Revolution because doctors thought it killed instantly, though modern science suggests the brain might remain conscious for seconds after the blade falls!
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