Entry 1 sense Webster, 1913 Purifier /pyo͝or'-əf-īˌ-ẽr/ · Pu·ri·fi·er · IPA /pjˈʊrəfˌaɪər/ 01 n. One who, or that which, purifies or cleanses; a cleanser; a refiner. 1. One who, or that which, purifies or cleanses; a cleanser; a refiner.