exfoliantPronunciation: /ɪksˈfəʊlɪəŋt, ɛks-/Definition of exfoliant noun a cosmetic product designed to remove dead cells from the surface of the skin: cosmetic companies urge you to buy clarifying lotions, toners, or exfoliants [as modifier]:a mild exfoliant effectOrigin: 1980s: from exfoliate + -antexfoliant in other Oxford dictionaries Definition of exfoliant in the US English dictionary