Medical Definition of emulsion
1a: a system (as fat in milk) consisting of a liquid dispersed with or without an emulsifier in an immiscible liquid usually in droplets of larger than colloidal sizeb: the state of such a system
2: suspension 2; especially : a suspension of a sensitive silver salt or a mixture of halides of silver in a viscous medium (as a gelatin solution) forming a coating on photographic plates, film, or paper
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