頜緣牙
Acrodont \Ac"ro*dont\, n. [Gr. 'a`kros summit + 'odoy`s, 'odo`ntos, a tooth.] (Zo["o]l.) One of a group of lizards having the teeth immovably united to the top of the alveolar ridge. -- a. Of or pertaining to the acrodonts.
acrodont n : an animal having teeth consolidated with the summit of the alveolar ridge without sockets