emulsion noun 4verb 1forms 3 noun4 •A stable suspension of small droplets of one liquid in another with which it is immiscible.Mayonnaise is an emulsion where egg is used to keep oil and water mixed. •A food preparation in which one or more ingredients are made into an emulsion. •A colloid in which both phases are liquid. •The coating of photosensitive silver halide grains in a thin gelatine layer on a photographic film. verb1 •To paint with emulsion paint. formsemulsioned · emulsioning · emulsions