emulsion

n. 1 fine dispersion of one liquid in another, esp. As paint, medicine, etc. 2 mixture of a silver compound in gelatin etc. For coating photographic plate or film. 3 emulsion paint. [latin mulgeo milk]

n. Any liquid preparation of a color and consistency resembling milk; as: (a) In pharmacy, an extract of seeds, or a mixture of oil and water united by a mucilaginous substance. (b) In photography, a liquid preparation of collodion holding salt of silver, used in the photographic process.