Etymology
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purifier (n.)

1550s, "one who purifies," agent noun from purify. As a type of mechanical apparatus, from 1834 (in reference to coal gas). Purificator in the ecclesiastical sense of "cloth used to wipe the chalice, etc., during mass" is by 1853, an agent-noun from Latin purificare.

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Definitions of purifier

purifier (n.)
an apparatus for removing impurities;
From wordnet.princeton.edu