Emulsion Health Dictionary

A medication in which an oil is suspended in water with the addition of an emulsifier. Quillaia bark (Soap bark), Lecithin, Acacia or other gum. A convenient way of applying oils to the skin, aiding penetration. Drying and cooling. Usually one part oil to ten parts water. 

n. a preparation in which fine droplets of one liquid (such as oil) are dispersed in another liquid (such as water). In pharmacy medicines are prepared in the form of emulsions to disguise the taste of an oil, which is dispersed in a flavoured liquid.