/ˈdentn/
Noun
1. A calcified tissue of the body, and along with enamel, cementum, and pulp is one of the four major components of teeth. Usually, it is covered by enamel on the crown and cementum on the root and surrounds the entire pulp. (wikipedia.org)
2. A calcareous material harder and denser than bone that comprises the bulk of a tooth. (Google Dictionary)
3. Bone (calcified tissue) surrounding the pulp cavity of a tooth. (wordnetweb.princeton.edu)
4. (Science: anatomy)
The dense calcified substance of which teeth are largely composed. It contains less animal matter than bone, and in the teeth of man is situated beneath the enamel. (biology-online.org)
Word origin: From Latin dens = tooth