na.

Noun

nail (plural nails)

1. The horny plate or appendage at the ends of the digits of various animals, including most reptiles, birds, and mammals (both nonhuman and human).

   Synonyms:

   onychium, unguis

   1. (often, specifically) The thin, flat type of such a plate on the fingers and toes of humans, chimpanzees and some other primates.
      • When I'm nervous I bite my nails.
2. The basal thickened portion of the anterior wings of certain hemiptera.
3. The terminal horny plate on the beak of ducks and other allied birds.
4. A spike-shaped metal fastener used for joining wood or similar materials. The nail is generally driven through two or more layers of material by means of impacts from a hammer or other device. It is then held in place by friction.
   • Yesterday my shirt got torn after I caught it on a nail.
5. A round pedestal on which merchants once carried out their business, such as the four nails outside The Exchange, Bristol.

See all 19 meanings of nail