noun

• A thin skin or film.
• (cooking) A skin or coating of proteins on the surface of meat to be smoked, improving the surface adhesion.
• Cuticle, the hard protective outer layer of certain life forms.
• The skin of a mushroom cap.
• (mycology) The outermost layer of a mushroom, often used only for a surface that is viscid and easily peels off.
• (cytology) A thin layer supporting the cell membrane in various protozoa.
• (biology) The growth on the surface of a liquid culture.
• (photography) The photosensitive emulsion of photographic film.
• (optics) A thin plastic membrane used as a beam splitter or protective cover.