Webster's English Dictionary

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emulsion

emul.sion \i-'m*l-sh*n\ \-'m*l-siv\ n [NL emulsion-, emulsio, fr. L 
   emulsus, pp. of emulge-re] to milk out, fr. e- + mulge-re to milk; akin to 
   OE melcan to milk, Gk amelgein 1a: a system (as fat in milk) consisting of 
   a liquid dispersed with or with out an emulsifier in an immiscible liquid 
   usu. in droplets of larger than colloidal size 1b: the state of such a 
   system  2: SUSPENSION; esp : a suspension of a sensitive silver salt  or 
   salts in a viscous medium (as a gelatin solution) forming a coating on 
   photographic plates, film, or paper - emul.sive aj