Exocarp.
A thin skin or film.
A skin or coating of proteins on the surface of meat to be smoked, improving the surface adhesion.
The growth on the surface of a liquid culture.
The skin of a mushroom cap.
A thin plastic membrane used as a beam splitter or protective cover.
The outermost layer of a mushroom, often used only for a surface that is viscid and easily peels off.
Cuticle, the hard protective outer layer of certain life forms.
The photosensitive emulsion of photographic film.