Source : Webster's Revised Unabridged Dictionary (1913)

Ophidia \O*phid"i*a\, n. pl. [NL., fr. Gr. ?, dim. of 'o`fis a
   snake.] (Zo["o]l.)
   The order of reptiles which includes the serpents.

   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.