The correct answer is (D) 1. A colloidal dispersion of one liquid in another; a suspension of small drops of one liquid in another liquid in which the former is not miscible; a mixture of two completely immiscible liquids, one of which is dispersed throughout the other in minute droplets. 2. The light-sensitive coating of a photographic film or plate.

Examples of use:

• In order to create an emulsion, he shook the oil and vinegar salad dressing until he could see oil droplets suspended throughout the vinegar.
  
  
• The emulsion that formed the coating of the film was a silver halide compound.