In anatomy, a nail is a horn-like structure at the end of an animal's finger or toe. See also claw.
http://en.wikipedia.org/wiki/Nail_%28anatomy%29

In engineering, woodworking and construction, a nail is a pin-shaped, sharp object of hard metal, typically steel, used as a fastener. Nails for specialised purposes may also be ...
http://en.wikipedia.org/wiki/Nail_%28engineering%29

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http://dictionary.reference.com/browse/nail