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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A thin skin; a pellicle; a membranous covering, causing opacity; hence, any thin, slight covering. He from thick films shall purge the visual ray. (Pope)

2. A slender thread, as that of a cobweb. Her whip of cricket's bone, the lash of film. (Shak)

Origin: as. Film skin, fr. Fell skin; akin to fylmen membrane, OFries. Filmene skin. See fell skin.

to cover with a thin skin or pellicle. It will but skin and film the ulcerous place. (Shak)