Nail (anatomy)
Human nails
Fingernails ToenailsA nail is a horn-like envelope covering the dorsal aspect of the terminal phalanges of fingers and toes in humans, most non-human primates, and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protein called keratin, as are animals' hooves and horns. The mammalian nail, claw, and hoof are all examples of unguis .
Read more about Nail (anatomy): Human Anatomy, Evolution
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“I can nail my left palm
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—Alan Dugan (b. 1923)