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emulsion (n.)

1610s, from French émulsion (16c.), from Modern Latin emulsionem (nominative emulsio), noun of action from past participle stem of emulgere "to milk out," from assimilated form of ex "out" (see ex-) + mulgere "to milk" (from PIE root *melg- "to rub off; to milk"). Milk is a classic instance of an emulsion, drops of one liquid dispersed throughout another.

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Definitions of emulsion from WordNet

emulsion (n.)
(chemistry) a colloid in which both phases are liquids;
an oil-in-water emulsion
emulsion (n.)
a light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin;
Synonyms: photographic emulsion
From wordnet.princeton.edu