Definition of emulsions:
(n) :
A stable suspension of small droplets of one liquid in another with which it is immiscible.
(n) :
(physical chemistry) A colloid in which both phases are liquid.
(v) :
(transitive) To paint with emulsion paint.
(n) :
(photography) The coating of photosensitive silver halide grains in a thin gelatine layer on a photographic film.