Physical Chemistry. any colloidal suspension of a liquid in another liquid.
such a suspension used in cosmetics.
Pharmacology. a liquid preparation consisting of two completely immiscible liquids, one of which, as minute globules coated by a gum or other mucilaginous substance, is dispersed throughout the other: used as a means of making a medicine palatable.
Photography. a composition sensitive to some or all of the actinic rays of light, consisting of one or more of the silver halides suspended in gelatin, applied in a thin layer to one surface of a film or the like.

1605–15; < Neo-Latin ēmulsiōn- (stem of ēmulsiō), equivalent to Latin ēmuls(us) milked out (ē- e-1 + mulsus, past participle of mulgēre to milk) + -iōn- -ion

emulsive, adjective
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World English Dictionary
emulsion (ɪˈmʌlʃən)
1.  photog a light-sensitive coating on a base, such as paper or film, consisting of fine grains of silver bromide suspended in gelatine
2.  chem a colloid in which both phases are liquids: an oil-in-water emulsion
3.  Also called: emulsion paint a type of paint in which the pigment is suspended in a vehicle, usually a synthetic resin, that is dispersed in water as an emulsion. It usually gives a mat finish
4.  pharmacol a mixture in which an oily medicine is dispersed in another liquid
5.  any liquid resembling milk
[C17: from New Latin ēmulsiō, from Latin ēmulsus milked out, from ēmulgēre to milk out, drain out, from mulgēre to milk]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1610s, from Fr. emulsion, from L. emulsus, pp. of emulgere "to milk out," from ex- "out" + mulgere "to milk." Milk is a classic instance of an emulsion, drops of one liquid dispersed throughout another.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

emulsion e·mul·sion (ĭ-mŭl'shən)
A suspension of small globules of one liquid in a second liquid with which the first will not mix.

e·mul'sive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
emulsion  [%PREMIUM_LINK%]     (ĭ-mŭl'shən)  Pronunciation Key 
A suspension of tiny droplets of one liquid in a second liquid. By making an emulsion, one can mix two liquids that ordinarily do not mix well, such as oil and water. Compare aerosol, foam.

emulsify verb
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Butter is basically an emulsion of water in fat, with some dairy solids that
  help hold them together.
Add the vegetable and olive oils in a slow stream, whisking constantly to form
  an emulsion.
Garden centers additionally sell organic liquid fertilizers such as fish
  emulsion and kelp emulsion.
They were a kind of emulsion formed by a combination of water and oil.
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