emulsion

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 salt of silver, platinum, etc. in gelatin or collodion, used to coat plates, film, and paper

Broken Cedar, pg. 222 PB

Another word that doesn't quite make sense. Does it smell like milk? Like a dark room? Like medicine? What?