emulsion
n.
5ModL emulsio < L emulsus, pp. of emulgere, to milk or drain out < e3, out + mulgere, to MILK6 a stable colloidal suspension, as milk, consisting of an immiscible liquid dispersed and held in another liquid by substances called emulsifiers; specif., a) Pharmacy such a suspension used as a vehicle for medication b) Photog. a suspension of a salt of silver, platinum, etc. in gelatin or collodion, used to coat plates, film, and paper
e[mul4sive 73siv8
adj.

emulsify = what you do when you shake the salad dressing hard enough to mix it thoroughly.