emulsion

Meanings

1. 1
   noun

   a dispersion of tiny droplets of one liquid in another liquid with which it does not normally mix

   Mayonnaise is an emulsion of oil and water stabilized by egg yolk.

2. 2
   noun

   a light-sensitive coating on photographic film or paper

   The particle track appeared as a dark line in the photographic emulsion.

Borrowed from French émulsion, from New Latin emulsio, based on Latin emulgere ("to milk out, extract"). The scientific sense developed from the image of one liquid dispersed through another.

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