What is "opoterodonta"

Ophidia \O*phid"i*a\, prop. n. pl. [NL., fr. Gr. ?, dim. of 'o`fis a snake.] (Zo["o]l.) The suborder of reptiles which includes the serpents; called also {Serpentes}.

Note: The most important divisions are: the Solenoglypha, having erectile perforated fangs, as the rattlesnake; the Proteroglypha, or elapine serpents, having permanently erect fang, as the cobra; the Asinea, or colubrine serpents, which are destitute of fangs; and the Opoterodonta, or Epanodonta, blindworms, in which the mouth is not dilatable.

Stenostome \Sten"o*stome\, a. [Gr. steno`s narrow, little + sto`ma mouth.] (Zo["o]l.) Having a small or narrow mouth; -- said of certain small ground snakes ( Opoterodonta), which are unable to dilate their jaws.