Microemulsion can be described as a stable mixture of two immiscible liquids, typically oil and water, which creates a transparent or translucent solution that appears as a single phase. However, if you're looking to diversify your vocabulary, there are several synonyms you can use to refer to this same concept. Some common alternatives might include ultrafine emulsions, nanoemulsions, and submicron emulsions. Ultimately, the specific term you use may depend on the context in which you're discussing microemulsions or the scientific jargon used in your field of study.