Gomphosis

noun

1. A type of immovable articulation, as of a tooth inserted into its bony socket.
2. A kind of synarthrosis or immovable articulation in which one part enters into another like a peg or nail.
3. A form of union or immovable articulation where a hard part is received into the cavity of a bone, as the teeth into the jaws.
4. a type of fibrous, immovable joint such as the one between the teeth and the alveolar bone