The Oxford Biblical Studies Online and Oxford Islamic Studies Online have retired. Content you previously purchased on Oxford Biblical Studies Online or Oxford Islamic Studies Online has now moved to Oxford Reference, Oxford Handbooks Online, Oxford Scholarship Online, or What Everyone Needs to Know®. For information on how to continue to view articles visit the subscriber services page.

Related Content

More Like This

Show all results sharing these subjects:

  • Medicine and health
  • Dentistry


Show Summary Details



Quick Reference

n. the extremely hard outer covering of the crown of a tooth. It is formed before tooth eruption by ameloblasts and consists of crystalline hydroxyapatite.

Reference entries

View all reference entries »