pellicle

1. A thin skin or film.

   thin protective membrane in some protozoa

2. A cuticle, the hard protective outer layer of certain life forms.

3. The outermost layer of a mushroom; the skin of a mushroom cap; especially, a surface that is viscid and easily peels off.

4. A thin layer supporting the cell membrane in various protozoa.

5. The growth on the surface of a liquid culture.

6. A skin or coating of proteins on the surface of meat to be smoked, improving the surface adhesion.

7. A coating of glycoproteins from saliva that forms on teeth; it offers some protection to the enamel from bacterial acidity.

8. The photosensitive emulsion of photographic film.

9. A thin plastic membrane used as a beam splitter or protective cover (for example, to protect a photomask).

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