noun [C,U]
1 any mixture of liquids that do not normally mix together, such as oil and water:
These saws normally use an oil / water emulsion as lubricant.
2 (also emulsion paint) (BrE) a type of paint used on walls and ceilings that dries without leaving a shiny surface:
silk / matt emulsion * They gave the walls a coat of white emulsion.
3 (technical) a substance on the surface of PHOTOGRAPHIC film that makes it sensitive to light:
photographic / film emulsion
