1 any mixture of liquids that do not normally mix together, such as oil and water 乳胶；乳浊液；乳状液

2 (also eˈmulsion paint) a type of paint used on walls and ceilings that dries without leaving a shiny surface 乳状漆（干后不留光泽）

3 (technical术语) a substance on the surface of film used for photographs that makes it sensitive to light 感光乳剂