purifierpu‧ri‧fi‧er /ˈpjʊərəfaɪə, ˈpjʊərɪfaɪə $ ˈpjʊrəfaɪər/ noun [countable] Word Family: noun: purification, purist, purity ≠ impurity, purifier; verb: purify; adverb: purely; adjective: pure ≠ impuresomething used to remove dirty or harmful substances air/water purifier