surfactant
noun [ C ] chemistry specialized uk/sɜːˈfæk.tənt/ us/sɝːˈfæk.tənt/
表面活性剂
a substance that reduces the surface tension of a liquid (= the natural force existing in a liquid that holds its surface together)
Surfactants are used, for example, as emulsifiers or in detergents. 例如，表面活性剂可用作乳化剂或洗涤剂。