(n.) Any liquid preparation of a color and consistency resembling milk; as: (a) In pharmacy, an extract of seeds, or a mixture of oil and water united by a mucilaginous substance. (b) In photography, a liquid preparation of collodion holding salt of silver, used in the photographic process.

backing bibliofilm bipack black-and-white film cartridge colloid colloider color film color negative film dope dry plate emulsification emulsifier emulsoid film frame microfilm monochromatic film motion-picture film negative orthochromatic film pack panchromatic film photographic paper plate printing paper roll sound film sound track sound-on-film soundstripe tripack vehicle