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emulsion

e·mul·sion (-mlshn) n.
1. A suspension of small globules of one liquid in a second liquid with which the first will not mix: an emulsion of oil in vinegar.
2. A photosensitive coating, usually of silver halide grains in a thin gelatin layer, on photographic film, paper, or glass.

[New Latin mulsi, mulsin-, from Latin mulsus, past participle of mulgre, to milk out : -, ex-, ex- + mulgre, to milk; see melg- in Indo-European Roots.]