tooth

noun

1.
hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
Derived from:
toothy
2.
something resembling the tooth of an animal
3.
toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell
4.
a means of enforcement
5.
one of a number of uniform projections on a gear