界かい面めん活かっ性せい剤ざいかいめんかっせいざいMeanings1nounsurfactantTechnical term used in chemistry, cosmetics, and detergents for a substance that reduces surface tension.この洗せん剤ざいには界かい面めん活かっ性せい剤ざいが多おおく含ふくまれている。This detergent contains a lot of surfactant.