1.(chemistry) a colloid in which both phases are liquids - an oil-in-water emulsion • Derivationally related forms: emulsify • Topics: chemistry, chemical science • Hypernyms: colloid 2. a light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin • Syn: photographic emulsion • Derivationally related forms: emulsify • Hypernyms: coating, coat • Substance Meronyms: silver nitrate, silver bromide