[emul.sion] n [NL emulsion-, emulsio, fr. L emulgere to milk out, fr. e- + mulgere to milk; akin to OE melcan to milk, Gk amelgein] (1612) 1 a: a system (as fat in milk) consisting of a liquid dispersed with or without an emulsifier in an immiscible liquid usu. in droplets of larger than colloidal size b: the state of such a system
2: suspension 2b(3); esp: a suspension of a sensitive silver salt or a mixture of silver halides in a viscous medium (as a gelatin solution) forming a coating on photographic plates, film, or paper