(Chapter 1) Footnote 14:

Hence Eng. gomphosis, the nail-like seating of the tooth in the jaw. The metaphor is traceable to the Hippocratics, who use gomfi/oj for molar; De morbis popularibus,; De ossium natura 12.10. That the term was in general use about the middle of the fifth century B.C. is attested by Herodotus 2.96.5, 9.83.9. See also Galen, De ossibus ad tirones 2.737-754 and De usu partium 3.854-879.