界かい面めん活かっ性せい剤ざいMeaningsNoun1. surfactantKanji used界realm面surface活activity性nature (of a person)剤chemical substancePitch accentかいめんかっせいざいComposed of界かい面めんinterfaceNoun活かっ性せいactivity; activeNoun剤ざいmedicine; agent; (chemical) substance; drug; doseSuffix