A person or device that removes toxic substances from something, especially an apparatus that detoxifies water or air.
From detoxicate + -or (agent noun suffix meaning 'one who does' or 'thing that does'). The suffix -or is the older form of -er in English agent nouns.
A water detoxicator at a factory might process thousands of gallons daily, removing heavy metals through chemistry—it's not a person, but a machine, which shows how English lets us use agent nouns for both people and equipment.
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